1 files changed, 1 insertions, 0 deletions

diff --git a/blastem.c b/blastem.c
index 2e0add7..baa4343 100644
--- a/blastem.c
+++ b/blastem.c
@@ -17,6 +17,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <ctype.h>
 
 #define BLASTEM_VERSION "0.3.0"