diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index 8247f6f..e28f6ee 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -420,7 +420,3 @@ if(ENABLE_SPIRV_TOOLS_INSTALL)
   install(FILES ${CMAKE_BINARY_DIR}/${SPIRV_TOOLS}Config.cmake DESTINATION ${PACKAGE_DIR})
 endif(ENABLE_SPIRV_TOOLS_INSTALL)
 
-if(MSVC AND (NOT ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")))
-  # Enable parallel builds across four cores for this lib
-  add_definitions(/MP4)
-endif()
diff --git a/source/fuzz/CMakeLists.txt b/source/fuzz/CMakeLists.txt
index 804fcf0..4915f07 100644
--- a/source/fuzz/CMakeLists.txt
+++ b/source/fuzz/CMakeLists.txt
@@ -419,10 +419,6 @@ if(SPIRV_BUILD_FUZZER)
         ${CMAKE_CURRENT_BINARY_DIR}/protobufs/spvtoolsfuzz.pb.cc
         )
 
-  if(MSVC AND (NOT ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")))
-    # Enable parallel builds across four cores for this lib
-    add_definitions(/MP4)
-  endif()
 
   spvtools_pch(SPIRV_TOOLS_FUZZ_SOURCES pch_source_fuzz)
 
diff --git a/source/opt/CMakeLists.txt b/source/opt/CMakeLists.txt
index 88d5658..e3faab7 100644
--- a/source/opt/CMakeLists.txt
+++ b/source/opt/CMakeLists.txt
@@ -218,11 +218,6 @@ set(SPIRV_TOOLS_OPT_SOURCES
   wrap_opkill.cpp
 )
 
-if(MSVC AND (NOT ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")))
-  # Enable parallel builds across four cores for this lib
-  add_definitions(/MP4)
-endif()
-
 spvtools_pch(SPIRV_TOOLS_OPT_SOURCES pch_source_opt)
 
 add_library(SPIRV-Tools-opt ${SPIRV_TOOLS_LIBRARY_TYPE} ${SPIRV_TOOLS_OPT_SOURCES})
diff --git a/source/reduce/CMakeLists.txt b/source/reduce/CMakeLists.txt
index e589ad5..b93a37b 100644
--- a/source/reduce/CMakeLists.txt
+++ b/source/reduce/CMakeLists.txt
@@ -71,10 +71,6 @@ set(SPIRV_TOOLS_REDUCE_SOURCES
         simple_conditional_branch_to_branch_reduction_opportunity.cpp
 )
 
-if(MSVC AND (NOT ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")))
-  # Enable parallel builds across four cores for this lib
-  add_definitions(/MP4)
-endif()
 
 spvtools_pch(SPIRV_TOOLS_REDUCE_SOURCES pch_source_reduce)