diff --git a/OpenCL/m10800_a0.cl b/OpenCL/m10800_a0.cl
index fff2393f0..af57dbf00 100644
--- a/OpenCL/m10800_a0.cl
+++ b/OpenCL/m10800_a0.cl
@@ -40,7 +40,7 @@ __constant u64 k_sha384[80] =
   SHA384C4c, SHA384C4d, SHA384C4e, SHA384C4f,
 };
 
-void sha384_transform (const u32x w0[4], const u32x w1[4], const u32x w2[4], const u32x w3[4], u64x digest[8])
+static void sha384_transform (const u32x w0[4], const u32x w1[4], const u32x w2[4], const u32x w3[4], u64x digest[8])
 {
   u64x w0_t = hl32_to_64 (w0[0], w0[1]);
   u64x w1_t = hl32_to_64 (w0[2], w0[3]);