diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index 3702647f9d..aa42ed9a87 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -432,9 +432,9 @@ if(BUILD_SHARED_LIBS)
   set(CMAKE_REQUEST_PIC "-DCMAKE_POSITION_INDEPENDENT_CODE=${CMAKE_POSITION_INDEPENDENT_CODE}")
   set(CUDA_REQUEST_PIC "-Xcompiler ${CMAKE_SHARED_LIBRARY_CXX_FLAGS}")
 else()
-  set(CONFIGURE_REQUEST_PIC "")
-  set(CMAKE_REQUEST_PIC "")
-  set(CUDA_REQUEST_PIC "")
+  set(CONFIGURE_REQUEST_PIC)
+  set(CMAKE_REQUEST_PIC)
+  set(CUDA_REQUEST_PIC)
 endif()