diff --git a/asminc/errno.inc b/asminc/errno.inc
index ef81036fc..972beaf9f 100644
--- a/asminc/errno.inc
+++ b/asminc/errno.inc
@@ -8,6 +8,7 @@
         .global         __maperrno, __osmaperrno
         .global         __seterrno
         .global         oserrcheck, setoserror
+        .global         seterrnofromoserror
 
 ; Error codes, must match the values in the C headers
 .enum
diff --git a/libsrc/common/maperrno.s b/libsrc/common/maperrno.s
index 0133b4606..cf8872e11 100644
--- a/libsrc/common/maperrno.s
+++ b/libsrc/common/maperrno.s
@@ -16,13 +16,13 @@
 __maperrno:
 	lda	__oserror		; Get the error code
        	beq    	L9			; Jump if no error
-setoserror:
+seterrnofromoserror:     
 	ldx	#$00			; Clear error
 	stx	__oserror
 	jsr	__osmaperrno		; Map the code
        	sta    	__errno
 	stx	__errno+1
-L9:	rts       
+L9:	rts