diff --git a/tools/hitag2crack/crack5opencl/hitag2.c b/tools/hitag2crack/crack5opencl/hitag2.c
index 97e89cb6e..9faec4c3b 100644
--- a/tools/hitag2crack/crack5opencl/hitag2.c
+++ b/tools/hitag2crack/crack5opencl/hitag2.c
@@ -6,26 +6,6 @@
 
 //#if FORCE_HITAG2_FULL == 0
 
-uint32_t hitag2_crypt(uint64_t x) {
-    const uint32_t ht2_function4a = 0x2C79; // 0010 1100 0111 1001
-    const uint32_t ht2_function4b = 0x6671; // 0110 0110 0111 0001
-    const uint32_t ht2_function5c = 0x7907287B; // 0111 1001 0000 0111 0010 1000 0111 1011
-
-    uint32_t bitindex;
-
-    bitindex = (ht2_function4a >> pickbits2_2(x, 1, 4)) & 1;
-    bitindex |= ((ht2_function4b << 1) >> pickbits1_1_2(x, 7, 11, 13)) & 0x02;
-    bitindex |= ((ht2_function4b << 2) >> pickbits1x4(x, 16, 20, 22, 25)) & 0x04;
-    bitindex |= ((ht2_function4b << 3) >> pickbits2_1_1(x, 27, 30, 32)) & 0x08;
-    bitindex |= ((ht2_function4a << 4) >> pickbits1_2_1(x, 33, 42, 45)) & 0x10;
-
-#if defined(DEBUG_HITAG2) && DEBUG_HITAG2 == 1
-    printf("hitag2_crypt bitindex = %02x\n", bitindex);
-#endif
-
-    return (ht2_function5c >> bitindex) & 1;
-}
-
 // try state
 
 // todo, changes arguments, only what is needed
diff --git a/tools/hitag2crack/crack5opencl/hitag2.h b/tools/hitag2crack/crack5opencl/hitag2.h
index 8ed6e8464..5ac4b7e50 100644
--- a/tools/hitag2crack/crack5opencl/hitag2.h
+++ b/tools/hitag2crack/crack5opencl/hitag2.h
@@ -34,8 +34,6 @@
 #define pickbits2_1_1(S, A, B, C)  ( ((S >> A) & 3) | ((S >> (B - 2)) & 4) | ((S >> (C - 3)) & 8) )
 #define pickbits1_2_1(S, A, B, C)  ( ((S >> A) & 1) | ((S >> (B - 1)) & 6) | ((S >> (C - 3)) & 8) )
 
-uint32_t hitag2_crypt(uint64_t x);
-
 // try_state
 bool try_state(uint64_t s, uint32_t uid, uint32_t aR2, uint32_t nR1, uint32_t nR2, uint64_t *key);