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-rw-r--r--ext/dl/ptr.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/dl/ptr.c b/ext/dl/ptr.c
index a1e77ca103d..8c2799a2b2f 100644
--- a/ext/dl/ptr.c
+++ b/ext/dl/ptr.c
@@ -3,6 +3,7 @@
*/
#include <ruby.h>
+#include <ctype.h>
#include <version.h> /* for ruby version code */
#include "dl.h"