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-rw-r--r--src/lib/string.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/lib/string.c b/src/lib/string.c
index a19f017852..eb6adb67c7 100644
--- a/src/lib/string.c
+++ b/src/lib/string.c
@@ -1,4 +1,5 @@
#include <assert.h>
+#include <ctype.h>
#include <rules.h>
#include <string.h>
#include <stddef.h>