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-rw-r--r--lib-src/ntlib.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib-src/ntlib.c b/lib-src/ntlib.c
index 0ecd4177d2c..83f653f3ea3 100644
--- a/lib-src/ntlib.c
+++ b/lib-src/ntlib.c
@@ -28,6 +28,7 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
+#include <ctype.h>
#include "ntlib.h"