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-rw-r--r--ext/dl/dl.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/dl/dl.c b/ext/dl/dl.c
index 6b7f01b3ff..073d8180d2 100644
--- a/ext/dl/dl.c
+++ b/ext/dl/dl.c
@@ -4,6 +4,7 @@
#include <ruby.h>
#include <rubyio.h>
+#include <ctype.h>
#include "dl.h"
VALUE rb_mDL;