1 files changed, 1 insertions, 0 deletions

diff --git a/src/sha1.h b/src/sha1.h
index dbcfe58..fe78bdf 100644
--- a/src/sha1.h
+++ b/src/sha1.h
@@ -9,6 +9,7 @@ extern "C" {
 #endif
 
 #include <stdint.h>
+#include <stdlib.h>
 
 typedef struct {
     uint32_t state[5];