diff --git a/Makefile.include b/Makefile.include
index 289b609c6..3ed193316 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -94,9 +94,9 @@ $(OBJECTDIR):
 
 ifdef APPS
   APPDS = ${wildcard ${foreach DIR, $(APPDIRS), ${addprefix $(DIR)/, $(APPS)}}} \
-	     ${wildcard ${addprefix $(CONTIKI)/apps/, $(APPS)} \
-	     ${addprefix $(CONTIKI)/platform/$(TARGET)/apps/, $(APPS)} \
-	     $(APPS)}
+             ${wildcard ${addprefix $(CONTIKI)/apps/, $(APPS)} \
+             ${addprefix $(CONTIKI)/platform/$(TARGET)/apps/, $(APPS)} \
+             $(APPS)}
   APPINCLUDES = ${foreach APP, $(APPS), ${wildcard ${foreach DIR, $(APPDS), $(DIR)/Makefile.$(APP)}}}
   -include $(APPINCLUDES)
   APP_SOURCES = ${foreach APP, $(APPS), $($(APP)_src)}
@@ -120,9 +120,9 @@ endif
 
 ifdef PLATFORMAPPS
   PLATFORMAPPDS = ${wildcard ${foreach DIR, $(APPDIRS), ${addprefix $(DIR)/, $(PLATFORMAPPS)}}} \
-	     ${wildcard ${addprefix $(CONTIKI)/apps/, $(PLATFORMAPPS)} \
-	     ${addprefix $(CONTIKI)/platform/$(TARGET)/apps/, $(PLATFORMAPPS)} \
-	     $(PLATFORMAPPS)}
+             ${wildcard ${addprefix $(CONTIKI)/apps/, $(PLATFORMAPPS)} \
+             ${addprefix $(CONTIKI)/platform/$(TARGET)/apps/, $(PLATFORMAPPS)} \
+             $(PLATFORMAPPS)}
   PLATFORMAPPINCLUDES = ${foreach APP, $(PLATFORMAPPS), \
       ${wildcard ${foreach DIR, $(PLATFORMAPPDS), $(DIR)/Makefile.$(APP)}}}
   -include $(PLATFORMAPPINCLUDES)