diff --git a/src/OpenFOAM/db/IOstreams/Sstreams/ISstream.H b/src/OpenFOAM/db/IOstreams/Sstreams/ISstream.H
index e41a96d6be..6064217a0a 100644
--- a/src/OpenFOAM/db/IOstreams/Sstreams/ISstream.H
+++ b/src/OpenFOAM/db/IOstreams/Sstreams/ISstream.H
@@ -134,7 +134,7 @@ public:
             inline int peek();
 
             //- Raw, low-level getline into a string function.
-            inline ISstream& getLine(string& str);
+            inline ISstream& getLine(std::string& str);
 
             //- Raw, low-level putback character function.
             inline ISstream& putback(const char c);
diff --git a/src/OpenFOAM/db/IOstreams/Sstreams/ISstreamI.H b/src/OpenFOAM/db/IOstreams/Sstreams/ISstreamI.H
index 6ceeb982c0..cffb9c898d 100644
--- a/src/OpenFOAM/db/IOstreams/Sstreams/ISstreamI.H
+++ b/src/OpenFOAM/db/IOstreams/Sstreams/ISstreamI.H
@@ -72,7 +72,7 @@ inline int Foam::ISstream::peek()
 }
 
 
-inline Foam::ISstream& Foam::ISstream::getLine(string& str)
+inline Foam::ISstream& Foam::ISstream::getLine(std::string& str)
 {
     std::getline(is_, str);
     setState(is_.rdstate());