diff --git a/assimpTargets-debug.cmake.in b/assimpTargets-debug.cmake.in
index e4ccbfba9..4cb917fd8 100644
--- a/assimpTargets-debug.cmake.in
+++ b/assimpTargets-debug.cmake.in
@@ -35,7 +35,7 @@ if(MSVC)
   endif()
   set(ASSIMP_LIBRARY_SUFFIX "@ASSIMP_LIBRARY_SUFFIX@-${MSVC_PREFIX}-mt" CACHE STRING "the suffix for the assimp windows library" )
 
-  file(TO_NATIVE_PATH ${_IMPORT_PREFIX} _IMPORT_PREFIX)
+  file(TO_NATIVE_PATH "${_IMPORT_PREFIX}" _IMPORT_PREFIX)
 
   if(ASSIMP_BUILD_SHARED_LIBS)
     set(sharedLibraryName "assimp${ASSIMP_LIBRARY_SUFFIX}@CMAKE_DEBUG_POSTFIX@@CMAKE_SHARED_LIBRARY_SUFFIX@")
diff --git a/assimpTargets-release.cmake.in b/assimpTargets-release.cmake.in
index 79b643a9a..702109305 100644
--- a/assimpTargets-release.cmake.in
+++ b/assimpTargets-release.cmake.in
@@ -35,7 +35,7 @@ if(MSVC)
   endif()
   set(ASSIMP_LIBRARY_SUFFIX "@ASSIMP_LIBRARY_SUFFIX@-${MSVC_PREFIX}-mt" CACHE STRING "the suffix for the assimp windows library" )
   	
-  file(TO_NATIVE_PATH ${_IMPORT_PREFIX} _IMPORT_PREFIX)
+  file(TO_NATIVE_PATH "${_IMPORT_PREFIX}" _IMPORT_PREFIX)
 
   if(ASSIMP_BUILD_SHARED_LIBS)
     set(sharedLibraryName "assimp${ASSIMP_LIBRARY_SUFFIX}@CMAKE_SHARED_LIBRARY_SUFFIX@")