diff --git a/examples/wireless/ofdm-validation.cc b/examples/wireless/ofdm-validation.cc
index abc8e32b8..87959faa4 100644
--- a/examples/wireless/ofdm-validation.cc
+++ b/examples/wireless/ofdm-validation.cc
@@ -24,6 +24,7 @@
 
 #include <fstream>
 #include <vector>
+#include <math.h>
 
 using namespace ns3;