diff --git a/libpostproc/postprocess.c b/libpostproc/postprocess.c
index 4890bf841a..d989a0afd7 100644
--- a/libpostproc/postprocess.c
+++ b/libpostproc/postprocess.c
@@ -101,14 +101,14 @@ try to unroll inner for(x=0 ... loop to avoid these damn if(x ... checks
 //#define NUM_BLOCKS_AT_ONCE 16 //not used yet
 
 #if defined(ARCH_X86)
-static DECLARE_ALIGNED(8, uint64_t attribute_used, w05)= 0x0005000500050005LL;
-static DECLARE_ALIGNED(8, uint64_t attribute_used, w04)= 0x0004000400040004LL;
-static DECLARE_ALIGNED(8, uint64_t attribute_used, w20)= 0x0020002000200020LL;
-static DECLARE_ALIGNED(8, uint64_t attribute_used, b00)= 0x0000000000000000LL;
-static DECLARE_ALIGNED(8, uint64_t attribute_used, b01)= 0x0101010101010101LL;
-static DECLARE_ALIGNED(8, uint64_t attribute_used, b02)= 0x0202020202020202LL;
-static DECLARE_ALIGNED(8, uint64_t attribute_used, b08)= 0x0808080808080808LL;
-static DECLARE_ALIGNED(8, uint64_t attribute_used, b80)= 0x8080808080808080LL;
+static DECLARE_ALIGNED(8, const uint64_t attribute_used, w05)= 0x0005000500050005LL;
+static DECLARE_ALIGNED(8, const uint64_t attribute_used, w04)= 0x0004000400040004LL;
+static DECLARE_ALIGNED(8, const uint64_t attribute_used, w20)= 0x0020002000200020LL;
+static DECLARE_ALIGNED(8, const uint64_t attribute_used, b00)= 0x0000000000000000LL;
+static DECLARE_ALIGNED(8, const uint64_t attribute_used, b01)= 0x0101010101010101LL;
+static DECLARE_ALIGNED(8, const uint64_t attribute_used, b02)= 0x0202020202020202LL;
+static DECLARE_ALIGNED(8, const uint64_t attribute_used, b08)= 0x0808080808080808LL;
+static DECLARE_ALIGNED(8, const uint64_t attribute_used, b80)= 0x8080808080808080LL;
 #endif
 
 static const int attribute_used deringThreshold= 20;