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-rw-r--r--src/stdlib/wcstoumax.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/stdlib/wcstoumax.c b/src/stdlib/wcstoumax.c
index a8f4680f..456ddedd 100644
--- a/src/stdlib/wcstoumax.c
+++ b/src/stdlib/wcstoumax.c
@@ -1,4 +1,5 @@
 #include <wchar.h>
+#include <wctype.h>
 #include <stdlib.h>
 #include <inttypes.h>
 #include <errno.h>