diff --git a/src/html/chm.cpp b/src/html/chm.cpp
index 9391bde450..a1d7e6be90 100644
--- a/src/html/chm.cpp
+++ b/src/html/chm.cpp
@@ -464,14 +464,14 @@ bool wxChmInputStream::Eof() const
     return (m_content==NULL ||
             m_contentStream==NULL ||
             m_contentStream->Eof() ||
-            m_pos>m_size);
+            (size_t)m_pos>m_size);
 }
 
 
 
 size_t wxChmInputStream::OnSysRead(void *buffer, size_t bufsize)
 {
-    if ( m_pos >= m_size )
+    if ( (size_t)m_pos >= m_size )
     {
         m_lasterror = wxSTREAM_EOF;
         return 0;
diff --git a/src/osx/cocoa/filedlg.mm b/src/osx/cocoa/filedlg.mm
index a267942860..99536113ee 100644
--- a/src/osx/cocoa/filedlg.mm
+++ b/src/osx/cocoa/filedlg.mm
@@ -419,7 +419,7 @@ int wxFileDialog::ShowModal()
     m_firstFileTypeFilter = -1;
 
     if ( m_useFileTypeFilter
-        && m_filterIndex >= 0 && m_filterIndex < m_filterExtensions.GetCount() )
+        && m_filterIndex >= 0 && (size_t)m_filterIndex < m_filterExtensions.GetCount() )
     {
         m_firstFileTypeFilter = m_filterIndex;
     }
diff --git a/src/osx/cocoa/glcanvas.mm b/src/osx/cocoa/glcanvas.mm
index f6bff5b1fb..d92f7d4494 100644
--- a/src/osx/cocoa/glcanvas.mm
+++ b/src/osx/cocoa/glcanvas.mm
@@ -87,7 +87,7 @@ WXGLPixelFormat WXGLChoosePixelFormat(const int *GLAttrs,
     if ( GLAttrs && n1 > 1 )
     {
         n1--; // skip the ending '0'
-        while ( p < n1 )
+        while ( p < (unsigned)n1 )
         {
             data[p] = (NSOpenGLPixelFormatAttribute) GLAttrs[p];
             p++;
@@ -98,7 +98,7 @@ WXGLPixelFormat WXGLChoosePixelFormat(const int *GLAttrs,
     {
         n2--; // skip the ending '0'
         unsigned p2 = 0;
-        while ( p2 < n2 )
+        while ( p2 < (unsigned)n2 )
             data[p++] = (NSOpenGLPixelFormatAttribute) ctxAttrs[p2++];
     }
 
diff --git a/src/osx/cocoa/msgdlg.mm b/src/osx/cocoa/msgdlg.mm
index 85eae7320d..f5e23a01e7 100644
--- a/src/osx/cocoa/msgdlg.mm
+++ b/src/osx/cocoa/msgdlg.mm
@@ -316,7 +316,7 @@ void* wxMessageDialog::ConstructNSAlert()
         m_buttonId[ m_buttonCount++ ] = wxID_HELP;
     }
 
-    wxASSERT_MSG( m_buttonCount <= WXSIZEOF(m_buttonId), "Too many buttons" );
+    wxASSERT_MSG( m_buttonCount <= (int)WXSIZEOF(m_buttonId), "Too many buttons" );
 
     return alert;
 }
diff --git a/src/osx/cocoa/textctrl.mm b/src/osx/cocoa/textctrl.mm
index 56d17d5e15..f8cf958591 100644
--- a/src/osx/cocoa/textctrl.mm
+++ b/src/osx/cocoa/textctrl.mm
@@ -168,7 +168,7 @@ NSView* wxMacEditHelper::ms_viewCurrentlyEdited = nil;
 
     if ( maxLength > 0 )
     {
-        if ( [*partialStringPtr length] > maxLength )
+        if ( [*partialStringPtr length] > (unsigned)maxLength )
         {
             field->SendMaxLenEvent();
             return NO;
@@ -909,7 +909,7 @@ bool wxNSTextViewControl::PositionToXY(long pos, long *x, long *y) const
     wxCHECK_MSG( pos >= 0, false, wxS("Invalid character position") );
 
     NSString* txt = [m_textView string];
-    if ( pos > [txt length] )
+    if ( (unsigned)pos > [txt length] )
         return false;
 
     // Last valid position is past the last character
@@ -987,7 +987,7 @@ long wxNSTextViewControl::XYToPosition(long x, long y) const
 
     // Return error if given x position
     // is past the line.
-    if ( x >= lineRng.length )
+    if ( (unsigned)x >= lineRng.length )
         return  -1;
 
     return lineRng.location + x;
@@ -1452,7 +1452,7 @@ bool wxNSTextFieldControl::PositionToXY(long pos, long *x, long *y) const
 {
     wxCHECK_MSG( pos >= 0, false, wxS("Invalid character position") );
 
-    if ( pos > [[m_textField stringValue] length] )
+    if ( (unsigned)pos > [[m_textField stringValue] length] )
         return false;
 
     if ( y )
@@ -1469,7 +1469,7 @@ long wxNSTextFieldControl::XYToPosition(long x, long y) const
     wxCHECK_MSG( x >= 0 && y >= 0, -1, wxS("Invalid line/column number") );
 
     // Last valid position is after the last character.
-    if ( y != 0 || x > [[m_textField stringValue] length] )
+    if ( y != 0 || (unsigned)x > [[m_textField stringValue] length] )
         return -1;
 
     return x;
diff --git a/src/osx/cocoa/window.mm b/src/osx/cocoa/window.mm
index b6d6a0f64f..bd249c3e3c 100644
--- a/src/osx/cocoa/window.mm
+++ b/src/osx/cocoa/window.mm
@@ -2025,7 +2025,7 @@ void wxCocoaGesturesImpl::TouchesMoved(NSEvent* event)
 
     // Iterate through all moving touches to check if the touch corresponding to "press"
     // in Press and Tap event is moving.
-    for ( int i = 0; i < [array count]; ++i )
+    for ( unsigned i = 0; i < [array count]; ++i )
     {
         NSTouch* touch = [array objectAtIndex:i];
 
@@ -2108,7 +2108,7 @@ void wxCocoaGesturesImpl::TouchesEnded(NSEvent* event)
         bool isPressTouch = false;
 
         // Iterate through all ended touches
-        for( int i = 0; i < [array count]; ++i )
+        for( unsigned i = 0; i < [array count]; ++i )
         {
             NSTouch* touch = [array objectAtIndex:i];