diff --git a/src/pkcs15init/pkcs15-lib.c b/src/pkcs15init/pkcs15-lib.c
index 9e39c033..8d45bd62 100644
--- a/src/pkcs15init/pkcs15-lib.c
+++ b/src/pkcs15init/pkcs15-lib.c
@@ -33,6 +33,7 @@
 #include <config.h>
 #endif
 #include <stdio.h>
+#include <stdlib.h>
 #include <ctype.h>
 #include <stdarg.h>
 #include <string.h>