diff --git a/src/server.h b/src/server.h
index 80281fac4..1e854abca 100644
--- a/src/server.h
+++ b/src/server.h
@@ -40,6 +40,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
 #include <string.h>
 #include <time.h>
 #include <limits.h>