diff --git a/src/drivers/Cairo/Fl_Cairo_Graphics_Driver.cxx b/src/drivers/Cairo/Fl_Cairo_Graphics_Driver.cxx
index ff64bfed0..b9d573a19 100644
--- a/src/drivers/Cairo/Fl_Cairo_Graphics_Driver.cxx
+++ b/src/drivers/Cairo/Fl_Cairo_Graphics_Driver.cxx
@@ -25,6 +25,7 @@
 #include <FL/fl_draw.H>
 #include <cairo/cairo.h>
 #include <pango/pangocairo.h>
+#include <math.h>
 
 // duplicated from Fl_PostScript.cxx
 struct callback_data {