diff --git a/CMakeLists.txt b/CMakeLists.txt
index 072332b9..847d9b5c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -130,6 +130,8 @@ if(SANITIZE)
 endif()
 append("${SANITIZE_CXXFLAGS}" DMD_CXXFLAGS)
 append("${SANITIZE_CXXFLAGS}" LDC_CXXFLAGS)
+# LLVM_CXXFLAGS may contain -Werror which causes compile errors with dmd source
+string(REPLACE "-Werror" "" LLVM_CXXFLAGS ${LLVM_CXXFLAGS})
 
 #
 # Run idgen and impcnvgen.