diff --git a/dlls/msi/tests/install.c b/dlls/msi/tests/install.c
index f3de7e7d608..0c50156bc83 100644
--- a/dlls/msi/tests/install.c
+++ b/dlls/msi/tests/install.c
@@ -40,8 +40,8 @@ static UINT (WINAPI *pMsiSourceListGetInfoA)
 static const char *msifile = "msitest.msi";
 static const char *msifile2 = "winetest2.msi";
 static const char *mstfile = "winetest.mst";
-CHAR CURR_DIR[MAX_PATH];
-CHAR PROG_FILES_DIR[MAX_PATH];
+static CHAR CURR_DIR[MAX_PATH];
+static CHAR PROG_FILES_DIR[MAX_PATH];
 
 /* msi database data */