diff --git a/OpenCL/m11800_a1.cl b/OpenCL/m11800_a1.cl
index 548a06c3f..63553653a 100644
--- a/OpenCL/m11800_a1.cl
+++ b/OpenCL/m11800_a1.cl
@@ -2233,7 +2233,7 @@ __constant u64 sbob_rc64[12][8] =
   },
 };
 
-void streebog_g (u64x h[8], const u64x m[8], __local u64 (*s_sbob_sl64)[256])
+static void streebog_g (u64x h[8], const u64x m[8], __local u64 (*s_sbob_sl64)[256])
 {
   u64x k[8];
   u64x s[8];