diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c
index 33019ff1..c3bd4d31 100644
--- a/src/stdio/vfprintf.c
+++ b/src/stdio/vfprintf.c
@@ -10,6 +10,7 @@
 #include <inttypes.h>
 #include <math.h>
 #include <float.h>
+#include "atomic.h"
 
 /* Some useful macros */
 
@@ -652,8 +653,7 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
 	return 1;
 
 inval:
-	errno = EINVAL;
-	return -1;
+	a_crash();
 overflow:
 	errno = EOVERFLOW;
 	return -1;