diff --git a/platform/apple2enh/lib/pfs.S b/platform/apple2enh/lib/pfs.S
index ed44dfc1e..5c2ac488c 100644
--- a/platform/apple2enh/lib/pfs.S
+++ b/platform/apple2enh/lib/pfs.S
@@ -66,7 +66,7 @@ read_count_out:	.word	$0000		    ;TRANS_COUNT
 close_param:	.byte	$01		    ;PARAM_COUNT
 close_fd:	.byte	$00		    ;REF_NUM
 ;---------------------------------------------------------------------
-	.segment	"INIT"
+	.segment	"ONCE"
 
 init_pfs:
 	; Allow exec() to keep file open
diff --git a/platform/c128/lib/pfs.S b/platform/c128/lib/pfs.S
index acec45959..62a2a7840 100644
--- a/platform/c128/lib/pfs.S
+++ b/platform/c128/lib/pfs.S
@@ -72,7 +72,7 @@ pw:	.byte	$2C, $50, $2C, $57	;,p,w
 cmdc:	.byte	0
 flags:	.res	10
 ;---------------------------------------------------------------------
-	.segment	"INIT"
+	.segment	"ONCE"
 
 init_pfs:
 	ldy	#F_MAXLEN+8
diff --git a/platform/c64/lib/pfs.S b/platform/c64/lib/pfs.S
index 35e64f652..c63d08d2e 100644
--- a/platform/c64/lib/pfs.S
+++ b/platform/c64/lib/pfs.S
@@ -72,7 +72,7 @@ pw:	.byte	$2C, $50, $2C, $57	;,p,w
 cmdc:	.byte	0
 flags:	.res	10
 ;---------------------------------------------------------------------
-	.segment	"INIT"
+	.segment	"ONCE"
 
 init_pfs:
 	ldy	#F_MAXLEN+8