diff --git a/utils/llvm-lit/CMakeLists.txt b/utils/llvm-lit/CMakeLists.txt
index b535eae..5857534 100644
--- a/utils/llvm-lit/CMakeLists.txt
+++ b/utils/llvm-lit/CMakeLists.txt
@@ -1,4 +1,9 @@
+if (WIN32 AND NOT CYGWIN)
+  # llvm-lit needs suffix.py for multiprocess to find a main module.
+  set(suffix .py)
+endif ()
+
 configure_file(
   llvm-lit.in
-  ${LLVM_TOOLS_BINARY_DIR}/llvm-lit
+  ${LLVM_TOOLS_BINARY_DIR}/llvm-lit${suffix}
   )
diff --git a/utils/llvm-lit/Makefile b/utils/llvm-lit/Makefile
index 77021bbc..ce1cac9 100644
--- a/utils/llvm-lit/Makefile
+++ b/utils/llvm-lit/Makefile
@@ -11,9 +11,14 @@
 
 include $(LEVEL)/Makefile.common
 
-all:: $(ToolDir)/llvm-lit
+# llvm-lit needs suffix.py for multiprocess to find a main module.
+ifeq ($(HOST_OS),MingW)
+  Suffix := .py
+endif
 
-$(ToolDir)/llvm-lit: llvm-lit.in Makefile $(ToolDir)/.dir
+all:: $(ToolDir)/llvm-lit$(Suffix)
+
+$(ToolDir)/llvm-lit$(Suffix): llvm-lit.in Makefile $(ToolDir)/.dir
 	$(Echo) "Creating 'llvm-lit' script..."
 	$(Verb)$(ECHOPATH) s=@LLVM_SOURCE_DIR@=$(LLVM_SRC_ROOT)=g > lit.tmp
 	$(Verb)$(ECHOPATH) s=@LLVM_BINARY_DIR@=$(LLVM_OBJ_ROOT)=g >> lit.tmp