diff --git a/deps/llvm.mk b/deps/llvm.mk
index e2913f5a13249..b69425a0e82df 100644
--- a/deps/llvm.mk
+++ b/deps/llvm.mk
@@ -52,6 +52,7 @@ endif # LLVM_VER != svn
 
 # Figure out which targets to build
 LLVM_TARGETS := host;NVPTX;AMDGPU
+LLVM_EXPERIMENTAL_TARGETS := WebAssembly
 
 LLVM_CFLAGS :=
 LLVM_CXXFLAGS :=
@@ -64,7 +65,7 @@ LLVM_CFLAGS += $(CFLAGS)
 LLVM_CXXFLAGS += $(CXXFLAGS)
 LLVM_CPPFLAGS += $(CPPFLAGS)
 LLVM_LDFLAGS += $(LDFLAGS)
-LLVM_CMAKE += -DLLVM_TARGETS_TO_BUILD:STRING="$(LLVM_TARGETS)" -DCMAKE_BUILD_TYPE="$(LLVM_CMAKE_BUILDTYPE)"
+LLVM_CMAKE += -DLLVM_TARGETS_TO_BUILD:STRING="$(LLVM_TARGETS)" -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="$(LLVM_EXPERIMENTAL_TARGETS)" -DCMAKE_BUILD_TYPE="$(LLVM_CMAKE_BUILDTYPE)"
 LLVM_CMAKE += -DLLVM_ENABLE_ZLIB=OFF -DLLVM_ENABLE_LIBXML2=OFF
 ifeq ($(USE_POLLY_ACC),1)
 LLVM_CMAKE += -DPOLLY_ENABLE_GPGPU_CODEGEN=ON