diff --git a/Makefile b/Makefile
index ea6ee2041..a5dd2a304 100644
--- a/Makefile
+++ b/Makefile
@@ -164,13 +164,15 @@ ifdef LLAMA_HIPBLAS
 	CC         := $(ROCM_PATH)/llvm/bin/clang
 	CXX        := $(ROCM_PATH)/llvm/bin/clang++
 	GPU_TARGETS = gfx900 gfx906 gfx908 gfx90a gfx1030
+	LLAMA_CUDA_DMMV_X ?= 64
+	LLAMA_CUDA_DMMV_Y ?= 1
 	CFLAGS     += -DGGML_USE_HIPBLAS -DGGML_USE_CUBLAS $(shell $(ROCM_PATH)/bin/hipconfig -C)
 	CXXFLAGS   += -DGGML_USE_HIPBLAS -DGGML_USE_CUBLAS $(shell $(ROCM_PATH)/bin/hipconfig -C)
 	LDFLAGS    += -L/opt/rocm/lib -Wl,-rpath=$(ROCM_PATH)/lib -lhipblas -lamdhip64
 	OBJS       += ggml-cuda.o
 ggml-cuda.o: CXXFLAGS += $(addprefix --offload-arch=,$(GPU_TARGETS))
-ggml-cuda.o: CXXFLAGS += -DGGML_CUDA_DMMV_X=64
-ggml-cuda.o: CXXFLAGS += -DGGML_CUDA_DMMV_Y=1
+ggml-cuda.o: CXXFLAGS += -DGGML_CUDA_DMMV_X=$(LLAMA_CUDA_DMMV_X)
+ggml-cuda.o: CXXFLAGS += -DGGML_CUDA_DMMV_Y=$(LLAMA_CUDA_DMMV_Y)
 ggml-cuda.o: ggml-cuda.cu ggml-cuda.h
 	$(CXX) $(CXXFLAGS) -x hip -c -o $@ $<
 endif