diff --git a/src/gnc-module/gnc-module.c b/src/gnc-module/gnc-module.c
index ed56b97730..36efd111bc 100644
--- a/src/gnc-module/gnc-module.c
+++ b/src/gnc-module/gnc-module.c
@@ -9,6 +9,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <glib.h>
+#ifdef G_OS_WIN32
+# undef DLL_EXPORT /* Will cause warnings in ltdl.h if defined */
+# define LIBLTDL_DLL_IMPORT
+#endif
 #include <ltdl.h>
 #include <guile/gh.h>
 #include <sys/types.h>
diff --git a/src/gnc-module/test/test-dynload.c b/src/gnc-module/test/test-dynload.c
index d2d7569a0a..04b102a913 100644
--- a/src/gnc-module/test/test-dynload.c
+++ b/src/gnc-module/test/test-dynload.c
@@ -5,6 +5,10 @@
  *********************************************************************/
 
 #include <stdio.h>
+#ifdef G_OS_WIN32
+# undef DLL_EXPORT /* Will cause warnings in ltdl.h if defined */
+# define LIBLTDL_DLL_IMPORT
+#endif
 #include <ltdl.h>
 #include <libguile.h>