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-rw-r--r--crypto/o_str.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/crypto/o_str.c b/crypto/o_str.c
index efe20b77a9..d626c98d0e 100644
--- a/crypto/o_str.c
+++ b/crypto/o_str.c
@@ -56,6 +56,7 @@
*
*/
+#include <ctype.h>
#include <strings.h>
#include "o_str.h"
#include <openssl/e_os2.h>