diff --git a/libs/spandsp/src/make_modem_filter.c b/libs/spandsp/src/make_modem_filter.c
index ec290c3e07..bd9427e24f 100644
--- a/libs/spandsp/src/make_modem_filter.c
+++ b/libs/spandsp/src/make_modem_filter.c
@@ -41,6 +41,10 @@
 #include <getopt.h>
 #endif
 
+#if defined (_MSC_VER)
+ #define __inline__ __inline
+#endif
+
 #include "spandsp/telephony.h"
 #include "spandsp/complex.h"
 #include "filter_tools.h"