diff --git a/include/setjmp.h b/include/setjmp.h
index 460829e38..5fac25634 100644
--- a/include/setjmp.h
+++ b/include/setjmp.h
@@ -42,8 +42,8 @@ typedef char jmp_buf [5];
 
 
 
-int __fastcall__ _setjmp (jmp_buf buf);
-#define setjmp  _setjmp         /* ISO insists on a macro */
+int __fastcall__ __setjmp (jmp_buf buf);
+#define setjmp  __setjmp         /* ISO insists on a macro */
 void __fastcall__ longjmp (jmp_buf buf, int retval) __attribute__((noreturn));
 
 
diff --git a/libsrc/common/setjmp.s b/libsrc/common/setjmp.s
index a763ac3ec..886853368 100644
--- a/libsrc/common/setjmp.s
+++ b/libsrc/common/setjmp.s
@@ -2,15 +2,15 @@
 ; 1998-06-06, Ullrich von Bassewitz
 ; 2015-09-11, Greg King
 ;
-; int __fastcall__ setjmp (jmp_buf buf);
+; int __fastcall__ __setjmp (jmp_buf buf);
 ;
 
-        .export         __setjmp
+        .export         ___setjmp
 
         .import         return0
         .importzp       sp, ptr1
 
-__setjmp:
+___setjmp:
         sta     ptr1            ; Save buf
         stx     ptr1+1
         ldy     #0