diff --git a/cpu/cc2430/8051def.h b/cpu/cc2430/8051def.h
index a1fa15e80..ce6bc3357 100644
--- a/cpu/cc2430/8051def.h
+++ b/cpu/cc2430/8051def.h
@@ -14,6 +14,11 @@
 
 #include <stdint.h>
 
+/* This port no longer implements the legacy clock_delay. Hack its usages
+ * outta the way till it gets phased out completely
+ * NB: This also overwrites the prototype so delay_usec() is declared twice */
+#define clock_delay(t) clock_delay_usec(t)
+
 /*
  * lint - style defines to help syntax parsers with sdcc-specific 8051 code
  * They don't interfere with actual compilation
diff --git a/cpu/cc2430/dev/cc2430_rf.c b/cpu/cc2430/dev/cc2430_rf.c
index 3e53a0f31..cbf997a38 100644
--- a/cpu/cc2430/dev/cc2430_rf.c
+++ b/cpu/cc2430/dev/cc2430_rf.c
@@ -126,7 +126,7 @@ cc2430_rf_command(uint8_t command)
     case ISTXON:
       fifo_count = RXFIFOCNT;
       RFST = command;
-      clock_delay(2);
+      clock_delay_usec(2);
       if(fifo_count != RXFIFOCNT) {
         RFST = ISFLUSHRX;
         RFST = ISFLUSHRX;
@@ -430,7 +430,7 @@ transmit(unsigned short transmit_len)
   cc2430_rf_command(ISTXON);
   counter = 0;
   while(!(RFSTATUS & TX_ACTIVE) && (counter++ < 3)) {
-    clock_delay(10);
+    clock_delay_usec(6);
   }
 
   if(!(RFSTATUS & TX_ACTIVE)) {
diff --git a/cpu/cc2430/dev/clock.c b/cpu/cc2430/dev/clock.c
index ac64ac300..92867e8b3 100644
--- a/cpu/cc2430/dev/clock.c
+++ b/cpu/cc2430/dev/clock.c
@@ -59,11 +59,11 @@ static volatile __data clock_time_t seconds = 0; /* Uptime in secs */
  * Each iteration is ~1.0xy usec, so this function delays for roughly len usec
  */
 void
-clock_delay(unsigned int len)
+clock_delay_usec(uint16_t len)
 {
   DISABLE_INTERRUPTS();
   while(len--) {
-    ASM(nop); ASM(nop); ASM(nop);
+    ASM(nop); ASM(nop);
     ASM(nop); ASM(nop);
   }
   ENABLE_INTERRUPTS();
diff --git a/cpu/cc253x/8051def.h b/cpu/cc253x/8051def.h
index a8cc59a81..72945ca31 100644
--- a/cpu/cc253x/8051def.h
+++ b/cpu/cc253x/8051def.h
@@ -19,6 +19,11 @@
 #include "dev/watchdog.h"
 #define watchdog_stop() watchdog_periodic()
 
+/* This port no longer implements the legacy clock_delay. Hack its usages
+ * outta the way till it gets phased out completely
+ * NB: This also overwrites the prototype so delay_usec() is declared twice */
+#define clock_delay(t) clock_delay_usec(t)
+
 /*
  * lint - style defines to help syntax parsers with sdcc-specific 8051 code
  * They don't interfere with actual compilation
diff --git a/cpu/cc253x/dev/cc2530-rf.c b/cpu/cc253x/dev/cc2530-rf.c
index 6adacc22c..f33d3ce37 100644
--- a/cpu/cc253x/dev/cc2530-rf.c
+++ b/cpu/cc253x/dev/cc2530-rf.c
@@ -287,7 +287,7 @@ transmit(unsigned short transmit_len)
 
   counter = 0;
   while(!(FSMSTAT1 & FSMSTAT1_TX_ACTIVE) && (counter++ < 3)) {
-    clock_delay(10);
+    clock_delay_usec(6);
   }
 
   if(!(FSMSTAT1 & FSMSTAT1_TX_ACTIVE)) {
diff --git a/cpu/cc253x/dev/clock.c b/cpu/cc253x/dev/clock.c
index dfcbc1c79..08a32f031 100644
--- a/cpu/cc253x/dev/clock.c
+++ b/cpu/cc253x/dev/clock.c
@@ -62,7 +62,7 @@ static volatile __data clock_time_t seconds = 0; /* Uptime in secs */
  * Each iteration is ~1.0xy usec, so this function delays for roughly len usec
  */
 void
-clock_delay(unsigned int len)
+clock_delay_usec(uint16_t len)
 {
   DISABLE_INTERRUPTS();
   while(len--) {
diff --git a/examples/cc2530dk/timer-test.c b/examples/cc2530dk/timer-test.c
index 65f641fc0..7d9844676 100644
--- a/examples/cc2530dk/timer-test.c
+++ b/examples/cc2530dk/timer-test.c
@@ -16,14 +16,14 @@
 
 #include <stdio.h>
 /*---------------------------------------------------------------------------*/
-#define TEST_CLOCK_DELAY     1
-#define TEST_RTIMER          1
-#define TEST_ETIMER          1
-#define TEST_CLOCK_SECONDS   1
+#define TEST_CLOCK_DELAY_USEC 1
+#define TEST_RTIMER           1
+#define TEST_ETIMER           1
+#define TEST_CLOCK_SECONDS    1
 /*---------------------------------------------------------------------------*/
 static struct etimer et;
 
-#if TEST_CLOCK_DELAY
+#if TEST_CLOCK_DELAY_USEC
 static rtimer_clock_t start_count, end_count, diff;
 #endif
 
@@ -64,16 +64,16 @@ PROCESS_THREAD(clock_test_process, ev, data)
 
   PROCESS_YIELD();
 
-#if TEST_CLOCK_DELAY
-  printf("Clock delay test, (10,000 x i) cycles:\n");
+#if TEST_CLOCK_DELAY_USEC
+  printf("clock_delay_usec test, (10,000 x i) usec:\n");
   i = 1;
   while(i < 7) {
     start_count = RTIMER_NOW();
-    clock_delay(10000 * i);
+    clock_delay_usec(10000 * i);
     end_count = RTIMER_NOW();
     diff = end_count - start_count;
-    printf("Delayed %u = %u rtimer ticks = ~%u us\n", 10000 * i, diff,
-        diff * 64);
+    printf("Requested: %u usec, Real: %u rtimer ticks = ~%u us\n",
+        10000 * i, diff, diff * 64);
     i++;
   }
 #endif
diff --git a/examples/sensinode/energy-scan/energy-scan.c b/examples/sensinode/energy-scan/energy-scan.c
index bb73f18a1..7f90e593a 100644
--- a/examples/sensinode/energy-scan/energy-scan.c
+++ b/examples/sensinode/energy-scan/energy-scan.c
@@ -76,7 +76,7 @@ PROCESS_THREAD(energy_scan, ev, data)
   while(1) {
     cmax = RSSI_BASE;
     cc2430_rf_channel_set(channel);
-    clock_delay(200);
+    clock_delay_usec(200);
 
     for(j = 0; j < RSSI_SAMPLES; j++) {
       t0 = RTIMER_NOW();
diff --git a/examples/sensinode/timer-test.c b/examples/sensinode/timer-test.c
index 65f641fc0..7d9844676 100644
--- a/examples/sensinode/timer-test.c
+++ b/examples/sensinode/timer-test.c
@@ -16,14 +16,14 @@
 
 #include <stdio.h>
 /*---------------------------------------------------------------------------*/
-#define TEST_CLOCK_DELAY     1
-#define TEST_RTIMER          1
-#define TEST_ETIMER          1
-#define TEST_CLOCK_SECONDS   1
+#define TEST_CLOCK_DELAY_USEC 1
+#define TEST_RTIMER           1
+#define TEST_ETIMER           1
+#define TEST_CLOCK_SECONDS    1
 /*---------------------------------------------------------------------------*/
 static struct etimer et;
 
-#if TEST_CLOCK_DELAY
+#if TEST_CLOCK_DELAY_USEC
 static rtimer_clock_t start_count, end_count, diff;
 #endif
 
@@ -64,16 +64,16 @@ PROCESS_THREAD(clock_test_process, ev, data)
 
   PROCESS_YIELD();
 
-#if TEST_CLOCK_DELAY
-  printf("Clock delay test, (10,000 x i) cycles:\n");
+#if TEST_CLOCK_DELAY_USEC
+  printf("clock_delay_usec test, (10,000 x i) usec:\n");
   i = 1;
   while(i < 7) {
     start_count = RTIMER_NOW();
-    clock_delay(10000 * i);
+    clock_delay_usec(10000 * i);
     end_count = RTIMER_NOW();
     diff = end_count - start_count;
-    printf("Delayed %u = %u rtimer ticks = ~%u us\n", 10000 * i, diff,
-        diff * 64);
+    printf("Requested: %u usec, Real: %u rtimer ticks = ~%u us\n",
+        10000 * i, diff, diff * 64);
     i++;
   }
 #endif
diff --git a/platform/cc2530dk/contiki-main.c b/platform/cc2530dk/contiki-main.c
index 5767f3fe4..512472bd4 100644
--- a/platform/cc2530dk/contiki-main.c
+++ b/platform/cc2530dk/contiki-main.c
@@ -343,7 +343,7 @@ main(void) CC_NON_BANKED
        * On occasion the XOSC is reported stable when in reality it's not.
        * We need to wait for a safeguard of 64us or more before selecting it
        */
-      clock_delay(10);
+      clock_delay_usec(65);
       while(CLKCONCMD & CLKCONCMD_OSC);         /* Wait till it's happened */
     }
 #endif /* LPM_MODE==LPM_MODE_PM2 */
diff --git a/platform/sensinode/contiki-sensinode-main.c b/platform/sensinode/contiki-sensinode-main.c
index 905695526..d059c24f2 100644
--- a/platform/sensinode/contiki-sensinode-main.c
+++ b/platform/sensinode/contiki-sensinode-main.c
@@ -371,7 +371,7 @@ main(void)
        * On occasion the XOSC is reported stable when in reality it's not.
        * We need to wait for a safeguard of 64us or more before selecting it
        */
-      clock_delay(10);
+      clock_delay_usec(65);
       while(CLKCON & OSC);         /* Wait till it's happened */
     }
 #endif /* LPM_MODE==LPM_MODE_PM2 */