diff --git a/win/rfb_win32/CleanDesktop.cxx b/win/rfb_win32/CleanDesktop.cxx
index 39cca11..60ea159 100644
--- a/win/rfb_win32/CleanDesktop.cxx
+++ b/win/rfb_win32/CleanDesktop.cxx
@@ -181,7 +181,7 @@
     }
 
     // -=- Switch of normal wallpaper and notify apps
-    SysParamsInfo(SPI_SETDESKWALLPAPER, 0, "", SPIF_SENDCHANGE);
+    SysParamsInfo(SPI_SETDESKWALLPAPER, 0, (PVOID) "", SPIF_SENDCHANGE);
     restoreWallpaper = true;
 
   } catch (rdr::Exception& e) {
@@ -225,7 +225,7 @@
     ImpersonateCurrentUser icu;
 
     vlog.debug("disable desktop pattern");
-    SysParamsInfo(SPI_SETDESKPATTERN, 0, "", SPIF_SENDCHANGE);
+    SysParamsInfo(SPI_SETDESKPATTERN, 0, (PVOID) "", SPIF_SENDCHANGE);
     restorePattern = true;
 
   } catch (rdr::Exception& e) {
diff --git a/win/rfb_win32/Makefile.am b/win/rfb_win32/Makefile.am
index 7c5d1c5..3d8545a 100644
--- a/win/rfb_win32/Makefile.am
+++ b/win/rfb_win32/Makefile.am
@@ -55,12 +55,10 @@
   WMShatter.h \
   WMWindowCopyRect.h
 
-
-##  CleanDesktop.cxx not built - MinGW does not provide COM
-
 librfb_win32_la_SOURCES = $(HDRS) \
   AboutDialog.cxx \
   CKeyboard.cxx \
+  CleanDesktop.cxx \
   Clipboard.cxx \
   CPointer.cxx \
   CurrentUser.cxx \