diff --git a/gio/tests/giomodule.c b/gio/tests/giomodule.c
index e832e95d3..cceabb8c4 100644
--- a/gio/tests/giomodule.c
+++ b/gio/tests/giomodule.c
@@ -22,6 +22,12 @@
 
 #include <gio/gio.h>
 
+#ifdef _MSC_VER
+# define MODULE_FILENAME_PREFIX ""
+#else
+# define MODULE_FILENAME_PREFIX "lib"
+#endif
+
 static void
 test_extension_point (void)
 {
@@ -108,7 +114,7 @@ test_module_scan_all_with_scope (void)
 
       ep = g_io_extension_point_register ("test-extension-point");
       scope = g_io_module_scope_new (G_IO_MODULE_SCOPE_BLOCK_DUPLICATES);
-      g_io_module_scope_block (scope, "libtestmoduleb." G_MODULE_SUFFIX);
+      g_io_module_scope_block (scope, MODULE_FILENAME_PREFIX "testmoduleb." G_MODULE_SUFFIX);
       g_io_modules_scan_all_in_directory_with_scope (g_test_get_filename (G_TEST_BUILT, "modules", NULL), scope);
       list = g_io_extension_point_get_extensions (ep);
       g_io_modules_scan_all_in_directory_with_scope (g_test_get_filename (G_TEST_BUILT, "modules/.libs", NULL), scope);
diff --git a/gio/tests/resources.c b/gio/tests/resources.c
index cb2c00a48..00e466aef 100644
--- a/gio/tests/resources.c
+++ b/gio/tests/resources.c
@@ -22,6 +22,12 @@
 #include "test_resources2.h"
 #include "digit_test_resources.h"
 
+#ifdef _MSC_VER
+# define MODULE_FILENAME_PREFIX ""
+#else
+# define MODULE_FILENAME_PREFIX "lib"
+#endif
+
 static void
 test_resource (GResource *resource)
 {
@@ -641,7 +647,9 @@ test_resource_module (void)
   if (g_module_supported ())
     {
       /* For in-tree, this will find the .la file and use it to get to the .so in .libs/ */
-      module = g_io_module_new (g_test_get_filename (G_TEST_BUILT, "libresourceplugin",  NULL));
+      module = g_io_module_new (g_test_get_filename (G_TEST_BUILT,
+                                                     MODULE_FILENAME_PREFIX "resourceplugin",
+                                                     NULL));
 
       error = NULL;
 
diff --git a/tests/module-test.c b/tests/module-test.c
index fbf23169f..8047b74ec 100644
--- a/tests/module-test.c
+++ b/tests/module-test.c
@@ -28,6 +28,12 @@
 #include <gmodule.h>
 #include <string.h>
 
+#ifdef _MSC_VER
+# define MODULE_FILENAME_PREFIX ""
+#else
+# define MODULE_FILENAME_PREFIX "lib"
+#endif
+
 gchar* global_state;
 
 G_MODULE_EXPORT void g_clash_func (void);
@@ -84,8 +90,8 @@ main (int    argc,
   if (!g_module_supported ())
     g_error ("dynamic modules not supported");
 
-  plugin_a = g_test_build_filename (G_TEST_BUILT, "libmoduletestplugin_a", NULL);
-  plugin_b = g_test_build_filename (G_TEST_BUILT, "libmoduletestplugin_b", NULL);
+  plugin_a = g_test_build_filename (G_TEST_BUILT, MODULE_FILENAME_PREFIX "moduletestplugin_a", NULL);
+  plugin_b = g_test_build_filename (G_TEST_BUILT, MODULE_FILENAME_PREFIX "moduletestplugin_b", NULL);
 
   /* module handles */