diff --git a/cmake/externals/tbb/CMakeLists.txt b/cmake/externals/tbb/CMakeLists.txt
index eef2cddd05..c0f2ef5c82 100644
--- a/cmake/externals/tbb/CMakeLists.txt
+++ b/cmake/externals/tbb/CMakeLists.txt
@@ -49,11 +49,11 @@ if (APPLE)
   )
 elseif (WIN32)
   if ("${MSVC_VERSION}" EQUAL "1700")
-    set(_TBB_MSVC_DIR, "vc11")
+    set(_TBB_MSVC_DIR "vc11")
   elseif ("${MSVC_VERSION}" EQUAL "1800")
-    set(_TBB_MSVC_DIR, "vc12")
+    set(_TBB_MSVC_DIR "vc12")
   elseif ("${MSVC_VERSION}" EQUAL "1900" OR "${MSVC_VERSION}" EQUAL "1910")
-    set(_TBB_MSVC_DIR, "vc14")
+    set(_TBB_MSVC_DIR "vc14")
   else()
     message(FATAL_ERROR "MSVC ${MSVC_VERSION} not supported by Intel TBB")
   endif()
diff --git a/cmake/modules/FindTBB.cmake b/cmake/modules/FindTBB.cmake
index 602dbf79ae..9a7fbd7c10 100644
--- a/cmake/modules/FindTBB.cmake
+++ b/cmake/modules/FindTBB.cmake
@@ -58,11 +58,11 @@ elseif (WIN32)
   endif()
 
   if ("${MSVC_VERSION}" EQUAL "1700")
-    set(_TBB_MSVC_DIR, "vc11")
+    set(_TBB_MSVC_DIR "vc11")
   elseif ("${MSVC_VERSION}" EQUAL "1800")
-    set(_TBB_MSVC_DIR, "vc12")
+    set(_TBB_MSVC_DIR "vc12")
   elseif ("${MSVC_VERSION}" EQUAL "1900" OR "${MSVC_VERSION}" EQUAL "1910")
-    set(_TBB_MSVC_DIR, "vc14")
+    set(_TBB_MSVC_DIR "vc14")
   else()
     message(FATAL_ERROR "MSVC ${MSVC_VERSION} not supported by Intel TBB")
   endif()