diff --git a/src/classes/PMusrCanvas.cpp b/src/classes/PMusrCanvas.cpp
index 5dd4e7b0..327a58ee 100644
--- a/src/classes/PMusrCanvas.cpp
+++ b/src/classes/PMusrCanvas.cpp
@@ -28,6 +28,7 @@
  ***************************************************************************/
 
 #include <iostream>
+#include <iomanip>
 #include <fstream>
 using namespace std;