diff --git a/src/osgPlugins/ive/DataInputStream.cpp b/src/osgPlugins/ive/DataInputStream.cpp
index 38342e07b..f696fcd0b 100644
--- a/src/osgPlugins/ive/DataInputStream.cpp
+++ b/src/osgPlugins/ive/DataInputStream.cpp
@@ -377,7 +377,7 @@ osg::Matrix DataInputStream::readMatrix()
     {
         for(int c=0;c<4;c++)
         {
-            mat(r,c) = readFloat();
+            mat(r,c) = readDouble();
         }
     }
 
diff --git a/src/osgPlugins/ive/DataOutputStream.cpp b/src/osgPlugins/ive/DataOutputStream.cpp
index e4bea437e..d6f99590f 100644
--- a/src/osgPlugins/ive/DataOutputStream.cpp
+++ b/src/osgPlugins/ive/DataOutputStream.cpp
@@ -266,7 +266,7 @@ void DataOutputStream::writeMatrix(const osg::Matrix& mat)
     {
         for(int c=0;c<4;c++)
         {
-            writeFloat(mat(r,c));
+            writeDouble(mat(r,c));
         }
     }
 }