diff --git a/win32/tuxpaint.iss b/win32/tuxpaint.iss
index 6c3d76d31..8ad1050a4 100644
--- a/win32/tuxpaint.iss
+++ b/win32/tuxpaint.iss
@@ -75,8 +75,8 @@ Source: "{#BdistDir}\*.dll"; DestDir: "{app}"; Flags: ignoreversion
 Source: "{#BdistDir}\*.exe"; DestDir: "{app}"; Flags: ignoreversion
 Source: "{#BdistDir}\data\*"; DestDir: "{app}\data"; Excludes: "CVS"; Flags: ignoreversion recursesubdirs createallsubdirs
 Source: "{#BdistDir}\docs\*"; DestDir: "{app}\docs"; Excludes: "CVS,Makefile,*~"; Flags: ignoreversion recursesubdirs createallsubdirs
-Source: "{#BdistDir}\etc\*"; DestDir: "{app}\etc"; Flags: ignoreversion recursesubdirs createallsubdirs
-Source: "{#BdistDir}\lib\*"; DestDir: "{app}\lib"; Flags: ignoreversion recursesubdirs createallsubdirs
+Source: "{#BdistDir}\etc\*"; DestDir: "{app}\etc"; Flags: skipifsourcedoesntexist ignoreversion recursesubdirs createallsubdirs
+Source: "{#BdistDir}\lib\*"; DestDir: "{app}\lib"; Flags: skipifsourcedoesntexist ignoreversion recursesubdirs createallsubdirs
 Source: "{#BdistDir}\im\*"; DestDir: "{app}\im"; Flags: ignoreversion recursesubdirs createallsubdirs
 Source: "{#BdistDir}\plugins\*"; DestDir: "{app}\plugins"; Flags: ignoreversion recursesubdirs createallsubdirs
 Source: "{#BdistDir}\locale\*"; DestDir: "{app}\locale"; Excludes: "CVS"; Flags: ignoreversion recursesubdirs createallsubdirs