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-rw-r--r--stdlib/isomac.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/stdlib/isomac.c b/stdlib/isomac.c
index 816298b210..e01fd384e3 100644
--- a/stdlib/isomac.c
+++ b/stdlib/isomac.c
@@ -70,6 +70,7 @@
 # define _GNU_SOURCE 1
 #endif
 
+#include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>