diff --git a/sys/include/ape/stdio.h b/sys/include/ape/stdio.h
index cadc93c40..80374c3b6 100644
--- a/sys/include/ape/stdio.h
+++ b/sys/include/ape/stdio.h
@@ -88,14 +88,8 @@ extern int fscanf(FILE *, const char *, ...);
 extern int printf(const char *, ...);
 extern int scanf(const char *, ...);
 extern int sprintf(char *, const char *, ...);
-#ifdef _C99_SNPRINTF_EXTENSION /* user knows about c99 out-of-bounds returns */
 extern int snprintf(char *, size_t, const char *, ...);
 extern int vsnprintf(char *, size_t, const char *, va_list);
-#else
-/* draw errors on any attempt to use *snprintf value so old code gets changed */
-extern void snprintf(char *, size_t, const char *, ...);
-extern void vsnprintf(char *, size_t, const char *, va_list);
-#endif
 extern int sscanf(const char *, const char *, ...);
 extern int vfprintf(FILE *, const char *, va_list);
 extern int vprintf(const char *, va_list);
diff --git a/sys/src/ape/lib/ap/stdio/snprintf.c b/sys/src/ape/lib/ap/stdio/snprintf.c
index 0c5c2ae8f..92ec50352 100644
--- a/sys/src/ape/lib/ap/stdio/snprintf.c
+++ b/sys/src/ape/lib/ap/stdio/snprintf.c
@@ -1,8 +1,6 @@
 /*
  * pANS stdio -- sprintf
  */
-#define _C99_SNPRINTF_EXTENSION
-
 #include "iolib.h"
 
 int snprintf(char *buf, size_t nbuf, const char *fmt, ...){
diff --git a/sys/src/ape/lib/ap/stdio/vsnprintf.c b/sys/src/ape/lib/ap/stdio/vsnprintf.c
index 45830fffb..57f8b8beb 100644
--- a/sys/src/ape/lib/ap/stdio/vsnprintf.c
+++ b/sys/src/ape/lib/ap/stdio/vsnprintf.c
@@ -1,8 +1,6 @@
 /*
  * pANS stdio -- vsnprintf
  */
-#define _C99_SNPRINTF_EXTENSION
-
 #include "iolib.h"
 
 int vsnprintf(char *buf, size_t nbuf, const char *fmt, va_list args){