2 files changed, 9 insertions, 0 deletions
diff --git a/src/fl_font_mac.cxx b/src/fl_font_mac.cxx
index fb6e4422b..826207aad 100644
--- a/src/fl_font_mac.cxx
+++ b/src/fl_font_mac.cxx
@@ -264,6 +264,11 @@ int fl_font_ = 0;
 int fl_size_ = 0;
 
 void fl_font(int fnum, int size) {
+  if (fnum==-1) {
+    fl_font_ = 0; 
+    fl_size_ = 0;
+    return;
+  }
   fl_font_ = fnum;
   fl_size_ = size;
   fl_font(find(fnum, size));
diff --git a/src/fl_font_x.cxx b/src/fl_font_x.cxx
index 2723a2197..9d3b0c639 100644
--- a/src/fl_font_x.cxx
+++ b/src/fl_font_x.cxx
@@ -200,6 +200,10 @@ void *fl_xftfont = 0;
 static GC font_gc;
 
 void fl_font(int fnum, int size) {
+  if (fnum==-1) {
+    fl_font_ = 0; fl_size_ = 0;
+    return;
+  }
   if (fnum == fl_font_ && size == fl_size_) return;
   fl_font_ = fnum; fl_size_ = size;
   Fl_FontSize* f = find(fnum, size);