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-rw-r--r--ext/json/ext/generator/generator.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/json/ext/generator/generator.h b/ext/json/ext/generator/generator.h
index 3220178..901b62c 100644
--- a/ext/json/ext/generator/generator.h
+++ b/ext/json/ext/generator/generator.h
@@ -4,6 +4,7 @@
#include <string.h>
#include <assert.h>
#include <math.h>
+#include <ctype.h>
#include "ruby.h"