diff --git a/ocl.c b/ocl.c
index 91ad2b57..018985d6 100644
--- a/ocl.c
+++ b/ocl.c
@@ -380,7 +380,7 @@ _clState *initCl(unsigned int gpu, char *name, size_t nameSize)
 	 */
 	char binaryfilename[255];
 	char filename[255];
-	char numbuf[10];
+	char numbuf[16];
 
 	if (cgpu->kernel == KL_NONE) {
 		if (opt_scrypt) {