diff --git a/tests/overmap_test.cpp b/tests/overmap_test.cpp
index c2110d5feab88..5a53f31a1118d 100644
--- a/tests/overmap_test.cpp
+++ b/tests/overmap_test.cpp
@@ -246,7 +246,7 @@ TEST_CASE( "mutable_overmap_placement", "[overmap][slow]" )
     constexpr int num_overmaps = 100;
     constexpr int num_trials_per_overmap = 100;
 
-    global_variables& globvars = get_globals();
+    global_variables &globvars = get_globals();
     globvars.clear_global_values();
 
     for( int j = 0; j < num_overmaps; ++j ) {