diff --git a/Src/Orbiter/MfdUser.cpp b/Src/Orbiter/MfdUser.cpp
index 52c846441..f2d8413fa 100644
--- a/Src/Orbiter/MfdUser.cpp
+++ b/Src/Orbiter/MfdUser.cpp
@@ -13,7 +13,7 @@
 #include "Psys.h"
 #include "Nav.h"
 #include <stdio.h>
-#include <strstream>
+#include <sstream>
 #include <iomanip>
 #include "Log.h"
 #include "Util.h"
@@ -397,11 +397,11 @@ void GraphMFD::Plot (HDC hDC, int g, int h0, int h1, const char *title)
 		}
 	}
 	if (gf.absc_title[0]) {
-		ostrstream oss(cbuf, 64);
+		ostringstream oss(cbuf, 64);
 		oss << gf.absc_title;
 		if (gf.absc_tickscale != 1.0f) oss << " x " << 1.0/gf.absc_tickscale;
 		oss << '\0';
-		TextOut (hDC, (x0+x1)/2, y0+(3*ch)/4, oss.str(), strlen(oss.str()));
+		TextOut (hDC, (x0+x1)/2, y0+(3*ch)/4, oss.str().c_str(), strlen(oss.str().c_str()));
 	}
 
 	// ordinate ticks/labels
@@ -430,11 +430,11 @@ void GraphMFD::Plot (HDC hDC, int g, int h0, int h1, const char *title)
 	SetTextAlign (hDC, TA_CENTER);
 	if (gf.data_title[0]) {
 		SelectDefaultFont (hDC, 2);
-		ostrstream oss(cbuf, 64);
+		ostringstream oss(cbuf, 64);
 		oss << gf.data_title;
 		if (gf.data_tickscale != 1.0f) oss << " x " << 1.0/gf.data_tickscale;
 		oss << '\0';
-		TextOut (hDC, 0, (y0+y1)/2, oss.str(), strlen(oss.str()));
+		TextOut (hDC, 0, (y0+y1)/2, oss.str().c_str(), strlen(oss.str().c_str()));
 	}
 
 	// plot frame
diff --git a/Src/Orbiter/Orbiter.cpp b/Src/Orbiter/Orbiter.cpp
index 76766ed6b..d4a1e869d 100644
--- a/Src/Orbiter/Orbiter.cpp
+++ b/Src/Orbiter/Orbiter.cpp
@@ -16,7 +16,6 @@
 #include <stdio.h>
 #include <time.h>
 #include <fstream>
-#include <strstream>
 #include <iomanip>
 #include <io.h>
 #include "cmdline.h"
diff --git a/Src/Orbiter/Vessel.cpp b/Src/Orbiter/Vessel.cpp
index 6af0e58ad..6b3122d0e 100644
--- a/Src/Orbiter/Vessel.cpp
+++ b/Src/Orbiter/Vessel.cpp
@@ -5554,10 +5554,10 @@ bool Vessel::VCRedrawEvent (int id, int event, SURFHANDLE surf) const
 
 bool Vessel::VCMouseEvent (int id, int event, Vector &p) const
 {
-	if (modIntf.v && modIntf.v->Version() >= 1) {
-		VECTOR3 v = _V(p.x,p.y,p.z);
-		return ((VESSEL2*)modIntf.v)->clbkVCMouseEvent (id, event, v);
-	}
+	if (modIntf.v && modIntf.v->Version() >= 1) {
+		VECTOR3 v = _V(p.x,p.y,p.z);
+		return ((VESSEL2*)modIntf.v)->clbkVCMouseEvent (id, event, v);
+	}
 	else
 		return false;
 }
@@ -8851,4 +8851,4 @@ bool VESSEL4::UnregisterMFDMode (int mode)
 int VESSEL4::clbkNavProcess (int mode)
 {
 	return mode;
-}
+}
diff --git a/Src/Plugin/Common/Dialog/Graph.cpp b/Src/Plugin/Common/Dialog/Graph.cpp
index b5ab5a727..030cbff47 100644
--- a/Src/Plugin/Common/Dialog/Graph.cpp
+++ b/Src/Plugin/Common/Dialog/Graph.cpp
@@ -13,7 +13,7 @@
 #include "Graph.h"
 #include <stdio.h>
 #include <math.h>
-#include <strstream>
+#include <sstream>
 #include "orbitersdk.h"
 
 static COLORREF plotcol[MAXPLOT] = { 0x0000ff, 0xff0000, 0x00ff00 };
@@ -232,12 +232,12 @@ void Graph::Refresh (HDC hDC, int w, int h)
 	}
 	
 	SelectObject (hDC, gdi.font[1]);
-	std::ostrstream oss(cbuf,64);
+	std::ostringstream oss(cbuf,64);
 	if (m_ylabel.size()) {
 		oss << m_ylabel;
 		if (m_tickscale && m_tickscale != 1.0f) oss << " x " << 1.0/m_tickscale;
 		oss << '\0';
-		TextOut (hDC, 0, (y0+y1)/2, oss.str(), strlen(oss.str()));
+		TextOut (hDC, 0, (y0+y1)/2, oss.str().c_str(), strlen(oss.str().c_str()));
 	}
 
 	SelectObject (hDC, pfont);