diff --git a/tools/sepolicy-analyze.c b/tools/sepolicy-analyze.c
index 4746fc7a657b7ae4a506dcbd7096fdad4605b7b1..afebd69708afc6057ce5c84588a14212b140d50c 100644
--- a/tools/sepolicy-analyze.c
+++ b/tools/sepolicy-analyze.c
@@ -12,6 +12,7 @@
 #include <sepol/policydb/expand.h>
 #include <sepol/policydb/util.h>
 #include <stdbool.h>
+#include <ctype.h>
 
 static int debug;
 static int warn;