diff --git a/libavfilter/vsrc_mandelbrot.c b/libavfilter/vsrc_mandelbrot.c
index 7bf97776cd..eef3b9e215 100644
--- a/libavfilter/vsrc_mandelbrot.c
+++ b/libavfilter/vsrc_mandelbrot.c
@@ -31,6 +31,7 @@
 #include "libavutil/opt.h"
 #include "libavutil/parseutils.h"
 #include <float.h>
+#include <math.h>
 
 #define SQR(a) ((a)*(a))