diff --git a/modules/FindMagnum.cmake b/modules/FindMagnum.cmake
index ef58d203c..b28d6fd22 100644
--- a/modules/FindMagnum.cmake
+++ b/modules/FindMagnum.cmake
@@ -455,8 +455,8 @@ foreach(_component ${Magnum_FIND_COMPONENTS})
             # Dynamic plugins don't have any prefix (e.g. `lib` on Linux),
             # search with empty prefix and then reset that back so we don't
             # accidentaly break something else
-            set(_tmp_prefixes ${CMAKE_FIND_LIBRARY_PREFIXES})
-            set(CMAKE_FIND_LIBRARY_PREFIXES ${CMAKE_FIND_LIBRARY_PREFIXES} "")
+            set(_tmp_prefixes "${CMAKE_FIND_LIBRARY_PREFIXES}")
+            set(CMAKE_FIND_LIBRARY_PREFIXES "${CMAKE_FIND_LIBRARY_PREFIXES};")
 
             # Try to find both debug and release version. Dynamic and static
             # debug libraries are in different places.