diff --git a/NPLib/Speg/TSpegPhysics.cxx b/NPLib/Speg/TSpegPhysics.cxx
index ee3e3b378e75983132103182fba672e519f87f42..892ea6c32fd57536c5893598bbd53c1136e04bfa 100644
--- a/NPLib/Speg/TSpegPhysics.cxx
+++ b/NPLib/Speg/TSpegPhysics.cxx
@@ -44,7 +44,6 @@
 #include <math.h>
 #include <stdlib.h>
 #include <time.h>
-#include <sstream>
 #include <limits>
 #include <TRandom1.h>
 #include <TRandom2.h>
diff --git a/NPLib/Speg/TSpegPhysics.h b/NPLib/Speg/TSpegPhysics.h
index 612b290a1e407cd7e9e680dccdca744b89181d81..3a9b68b23aa9eec9029d80fe49562c29e23d56dd 100644
--- a/NPLib/Speg/TSpegPhysics.h
+++ b/NPLib/Speg/TSpegPhysics.h
@@ -24,7 +24,6 @@
  
 //   STL
 #include <vector>
-#include <sstream>
 #include <iostream>
 #include <cmath>
 #include <stdlib.h>