diff --git a/epan/filter_expressions.h b/epan/filter_expressions.h
index 60b051ff5c..9ee5baffca 100644
--- a/epan/filter_expressions.h
+++ b/epan/filter_expressions.h
@@ -25,6 +25,10 @@
 #ifndef __FILTER_EXPRESSIONS_H__
 #define __FILTER_EXPRESSIONS_H__
 
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
 struct filter_expression {
 	gpointer button;	/* Filter toolbar */
 	gchar	*label;
@@ -44,4 +48,8 @@ struct filter_expression *filter_expression_new(const gchar *label,
 
 void filter_expression_init(gboolean prefs);
 
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
 #endif /* __FILTER_EXPRESSIONS_H__ */