diff --git a/Makefile.am b/Makefile.am
index 2cf49ba..ea8c9b7 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -105,7 +105,7 @@ x11/cuda_x11_luffa512.o: x11/cuda_x11_luffa512.cu
 	$(NVCC) $(nvcc_FLAGS) --maxrregcount=80 -o $@ -c $<
 
 x11/cuda_x11_luffa512_Cubehash.o: x11/cuda_x11_luffa512_Cubehash.cu
-	$(NVCC) $(nvcc_FLAGS) --maxrregcount=80 -o $@ -c $<
+	$(NVCC) $(nvcc_FLAGS) --maxrregcount=76 -o $@ -c $<
 
 x13/cuda_x13_hamsi512.o: x13/cuda_x13_hamsi512.cu
 	$(NVCC) $(nvcc_FLAGS) --maxrregcount=72 -o $@ -c $<
diff --git a/ccminer.vcxproj b/ccminer.vcxproj
index d42e263..235e36c 100644
--- a/ccminer.vcxproj
+++ b/ccminer.vcxproj
@@ -455,7 +455,7 @@
     </CudaCompile>
     <CudaCompile Include="x11\cuda_x11_luffa512.cu" />
     <CudaCompile Include="x11\cuda_x11_luffa512_Cubehash.cu">
-      <MaxRegCount>80</MaxRegCount>
+      <MaxRegCount>76</MaxRegCount>
     </CudaCompile>
     <CudaCompile Include="x11\cuda_x11_shavite512.cu">
       <MaxRegCount>128</MaxRegCount>
diff --git a/x11/cuda_x11_luffa512_Cubehash.cu b/x11/cuda_x11_luffa512_Cubehash.cu
index 1e7b914..cab0062 100644
--- a/x11/cuda_x11_luffa512_Cubehash.cu
+++ b/x11/cuda_x11_luffa512_Cubehash.cu
@@ -731,8 +731,6 @@ static void finalization512(uint32_t *statebuffer, uint32_t *statechainv, uint32
 __global__
 #if __CUDA_ARCH__ > 500
 __launch_bounds__(256, 4)
-#else
-__launch_bounds__(256, 3)
 #endif
 void x11_luffaCubehash512_gpu_hash_64(uint32_t threads, uint32_t *g_hash)
 {