diff --git a/Makefile b/Makefile
index 761ccbb..63f4ca7 100644
--- a/Makefile
+++ b/Makefile
@@ -38,6 +38,7 @@ BASH=
 endif
 
 CLANG_VERSION=$(shell $(BASH) ./llvm_version.sh $(LLVM_PROJ_DIR))
+CLANG_MAJOR_VERSION=$(shell $(BASH) ./llvm_version_major.sh $(LLVM_PROJ_DIR))
 VERSION:=$(shell $(BASH) ./version.sh)
 DEBUG_PREFIX_MAP=-fdebug-prefix-map=$(ROOT_DIR)=wasisdk://v$(VERSION)
 
@@ -134,7 +135,7 @@ build/compiler-rt.BUILT: build/llvm.BUILT build/wasi-libc.BUILT
 		-DCMAKE_C_FLAGS="$(DEBUG_PREFIX_MAP)" \
 		-DLLVM_CONFIG_PATH=$(ROOT_DIR)/build/llvm/bin/llvm-config \
 		-DCOMPILER_RT_OS_DIR=wasi \
-		-DCMAKE_INSTALL_PREFIX=$(PREFIX)/lib/clang/$(CLANG_VERSION)/ \
+		-DCMAKE_INSTALL_PREFIX=$(PREFIX)/lib/clang/$(CLANG_MAJOR_VERSION)/ \
 		-DCMAKE_VERBOSE_MAKEFILE:BOOL=ON \
 		$(LLVM_PROJ_DIR)/compiler-rt/lib/builtins
 	DESTDIR=$(DESTDIR) ninja $(NINJA_FLAGS) -C build/compiler-rt install
diff --git a/llvm_version_major.sh b/llvm_version_major.sh
new file mode 100755
index 0000000..2e5d973
--- /dev/null
+++ b/llvm_version_major.sh
@@ -0,0 +1,4 @@
+#/bin/bash
+LLVM_PROJ_DIR=${1:-./src/llvm-project}
+MAJOR=`grep "set(LLVM_VERSION_MAJOR" $LLVM_PROJ_DIR/llvm/CMakeLists.txt | awk '{print substr($2, 1, length($2) - 1)}'`
+echo $MAJOR