diff --git a/src/gtk/textctrl.cpp b/src/gtk/textctrl.cpp
index a655706aa5..46345f1820 100644
--- a/src/gtk/textctrl.cpp
+++ b/src/gtk/textctrl.cpp
@@ -160,7 +160,9 @@ gtk_scrollbar_changed_callback( GtkWidget *WXUNUSED(widget), wxTextCtrl *win )
 
 extern bool wxIsInsideYield;
 
-typedef void (*GtkDrawCallback)(GtkWidget *widget, GdkRectangle *rect);
+extern "C" {
+    typedef void (*GtkDrawCallback)(GtkWidget *widget, GdkRectangle *rect);
+}
 
 static GtkDrawCallback gs_gtk_text_draw = NULL;
 
diff --git a/src/gtk1/textctrl.cpp b/src/gtk1/textctrl.cpp
index a655706aa5..46345f1820 100644
--- a/src/gtk1/textctrl.cpp
+++ b/src/gtk1/textctrl.cpp
@@ -160,7 +160,9 @@ gtk_scrollbar_changed_callback( GtkWidget *WXUNUSED(widget), wxTextCtrl *win )
 
 extern bool wxIsInsideYield;
 
-typedef void (*GtkDrawCallback)(GtkWidget *widget, GdkRectangle *rect);
+extern "C" {
+    typedef void (*GtkDrawCallback)(GtkWidget *widget, GdkRectangle *rect);
+}
 
 static GtkDrawCallback gs_gtk_text_draw = NULL;