diff --git a/src/osx/cocoa/glcanvas.mm b/src/osx/cocoa/glcanvas.mm
index bebcdcefdb..8ca1d7ab86 100644
--- a/src/osx/cocoa/glcanvas.mm
+++ b/src/osx/cocoa/glcanvas.mm
@@ -187,7 +187,7 @@ WXGLPixelFormat WXGLChoosePixelFormat(const int *attribList)
                         if ( !attribList[arg++] )
                             break;
 
-                        return false;
+                        return nil;
                     }
 
                     data[p++] = NSOpenGLPFASampleBuffers;
@@ -204,7 +204,7 @@ WXGLPixelFormat WXGLChoosePixelFormat(const int *attribList)
                         if ( !attribList[arg++] )
                             break;
 
-                        return false;
+                        return nil;
                     }
 
                     data[p++] = NSOpenGLPFASamples;
diff --git a/src/richtext/richtextbuffer.cpp b/src/richtext/richtextbuffer.cpp
index 5935ac9d43..21f4d653cf 100644
--- a/src/richtext/richtextbuffer.cpp
+++ b/src/richtext/richtextbuffer.cpp
@@ -8914,7 +8914,7 @@ wxRichTextCell* wxRichTextTable::GetCell(int row, int col) const
         return wxDynamicCast(obj, wxRichTextCell);
     }
     else
-        return false;
+        return NULL;
 }
 
 // Returns a selection object specifying the selections between start and end character positions.