diff --git a/OpenCL/m09710_a1.cl b/OpenCL/m09710_a1.cl
index 76c0ca1b2..fd9d8a675 100644
--- a/OpenCL/m09710_a1.cl
+++ b/OpenCL/m09710_a1.cl
@@ -23,7 +23,7 @@ typedef struct
 
 } RC4_KEY;
 
-void swap (__local RC4_KEY *rc4_key, const u8 i, const u8 j)
+static void swap (__local RC4_KEY *rc4_key, const u8 i, const u8 j)
 {
   u8 tmp;
 
@@ -32,7 +32,7 @@ void swap (__local RC4_KEY *rc4_key, const u8 i, const u8 j)
   rc4_key->S[j] = tmp;
 }
 
-void rc4_init_16 (__local RC4_KEY *rc4_key, const u32 data[4])
+static void rc4_init_16 (__local RC4_KEY *rc4_key, const u32 data[4])
 {
   u32 v = 0x03020100;
   u32 a = 0x04040404;
@@ -85,7 +85,7 @@ void rc4_init_16 (__local RC4_KEY *rc4_key, const u32 data[4])
   }
 }
 
-u8 rc4_next_16 (__local RC4_KEY *rc4_key, u8 i, u8 j, const u32 in[4], u32 out[4])
+static u8 rc4_next_16 (__local RC4_KEY *rc4_key, u8 i, u8 j, const u32 in[4], u32 out[4])
 {
   #ifdef _unroll
   #pragma unroll
@@ -138,7 +138,7 @@ u8 rc4_next_16 (__local RC4_KEY *rc4_key, u8 i, u8 j, const u32 in[4], u32 out[4
   return j;
 }
 
-void md5_transform (const u32 w0[4], const u32 w1[4], const u32 w2[4], const u32 w3[4], u32 digest[4])
+static void md5_transform (const u32 w0[4], const u32 w1[4], const u32 w2[4], const u32 w3[4], u32 digest[4])
 {
   u32 a = digest[0];
   u32 b = digest[1];