diff --git a/src/pki_gcrypt.c b/src/pki_gcrypt.c
index 1362229d..cf9ac781 100644
--- a/src/pki_gcrypt.c
+++ b/src/pki_gcrypt.c
@@ -28,6 +28,7 @@
 #ifdef HAVE_LIBGCRYPT
 
 #include <assert.h>
+#include <stdbool.h>
 #include <string.h>
 #include <stdlib.h>
 #include <gcrypt.h>