diff --git a/plugins-root/check_icmp.c b/plugins-root/check_icmp.c
index 4da6ea16..845fc95d 100644
--- a/plugins-root/check_icmp.c
+++ b/plugins-root/check_icmp.c
@@ -70,6 +70,7 @@ const char *email = "nagiosplug-devel@lists.sourceforge.net";
 #include <netinet/ip_icmp.h>
 #include <arpa/inet.h>
 #include <signal.h>
+#include <float.h>
 
 
 /** sometimes undefined system macros (quite a few, actually) **/