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-rw-r--r--src/runtime/c/gu/ucs.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/runtime/c/gu/ucs.c b/src/runtime/c/gu/ucs.c
index 0bfce2461..846c33289 100644
--- a/src/runtime/c/gu/ucs.c
+++ b/src/runtime/c/gu/ucs.c
@@ -1,5 +1,6 @@
#include <gu/ucs.h>
#include <gu/assert.h>
+#include <stdlib.h>
bool
gu_char_is_valid(char c)