diff --git a/llvm/tools/llvm-config/CMakeLists.txt b/llvm/tools/llvm-config/CMakeLists.txt
index d45877135ba2..744fa4e44d12 100644
--- a/llvm/tools/llvm-config/CMakeLists.txt
+++ b/llvm/tools/llvm-config/CMakeLists.txt
@@ -37,7 +37,11 @@ set(LLVM_CXXFLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${uppercase_CMAKE_BUILD_
 set(LLVM_BUILD_SYSTEM cmake)
 set(LLVM_HAS_RTTI ${LLVM_CONFIG_HAS_RTTI})
 set(LLVM_DYLIB_VERSION "${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}${LLVM_VERSION_SUFFIX}")
-set(LLVM_HAS_GLOBAL_ISEL "${LLVM_BUILD_GLOBAL_ISEL}")
+if(LLVM_BUILD_GLOBAL_ISEL)
+  set(LLVM_HAS_GLOBAL_ISEL "ON")
+else()
+  set(LLVM_HAS_GLOBAL_ISEL "OFF")
+endif()
 
 # Use the C++ link flags, since they should be a superset of C link flags.
 set(LLVM_LDFLAGS "${CMAKE_CXX_LINK_FLAGS}")