diff --git a/src/BulletSoftBody/btSoftBodyHelpers.cpp b/src/BulletSoftBody/btSoftBodyHelpers.cpp
index eac45284c..1c0d65f42 100644
--- a/src/BulletSoftBody/btSoftBodyHelpers.cpp
+++ b/src/BulletSoftBody/btSoftBodyHelpers.cpp
@@ -18,6 +18,7 @@ subject to the following restrictions:
 #include <stdio.h>
 #include <string>
 #include <iostream>
+#include <iomanip> 
 #include <sstream>
 #include <string.h>
 #include <algorithm>