diff --git a/offload/CMakeLists.txt b/offload/CMakeLists.txt
index 03b62018656202..ead2aed414ffe7 100644
--- a/offload/CMakeLists.txt
+++ b/offload/CMakeLists.txt
@@ -7,6 +7,8 @@ set(LLVM_SUBPROJECT_TITLE "liboffload")
 if ("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
   set(OPENMP_STANDALONE_BUILD TRUE)
   project(offload C CXX ASM)
+else()
+  set(OPENMP_STANDALONE_BUILD FALSE)
 endif()
 
 # Check that the library can actually be built.
diff --git a/openmp/CMakeLists.txt b/openmp/CMakeLists.txt
index e565354ccc7f2b..3b4259dfa380e8 100644
--- a/openmp/CMakeLists.txt
+++ b/openmp/CMakeLists.txt
@@ -13,6 +13,8 @@ list(INSERT CMAKE_MODULE_PATH 0
 if (OPENMP_STANDALONE_BUILD OR "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
   set(OPENMP_STANDALONE_BUILD TRUE)
   project(openmp C CXX ASM)
+else()
+  set(OPENMP_STANDALONE_BUILD FALSE)
 endif()
 
 # Must go below project(..)