diff --git a/win32/installer/zoitechat.iss.tt b/win32/installer/zoitechat.iss.tt
index 4d252534..210e9e97 100644
--- a/win32/installer/zoitechat.iss.tt
+++ b/win32/installer/zoitechat.iss.tt
@@ -113,7 +113,7 @@ Source: "readme.url"; DestDir: "{app}"; Flags: ignoreversion; Components: libs
 Source: "cert.pem"; DestDir: "{app}"; Flags: ignoreversion; Components: libs
 Source: "share\xml\*"; DestDir: "{app}\share\xml"; Flags: ignoreversion createallsubdirs recursesubdirs; Components: libs
 Source: "share\doc\*"; DestDir: "{app}\share\doc"; Flags: ignoreversion createallsubdirs recursesubdirs; Components: libs
-Source: "share\themes\MS-Windows\*"; DestDir: "{app}\share\themes\MS-Windows"; Flags: ignoreversion createallsubdirs recursesubdirs; Components: libs
+Source: "share\themes\MS-Windows\*"; DestDir: "{app}\share\themes\MS-Windows"; Flags: ignoreversion createallsubdirs recursesubdirs skipifsourcedoesntexist; Components: libs
 Source: "share\locale\*"; DestDir: "{app}\share\locale"; Flags: ignoreversion createallsubdirs recursesubdirs; Components: translations
 Source: "etc\fonts\*"; DestDir: "{app}\etc\fonts"; Flags: ignoreversion createallsubdirs recursesubdirs; Components: libs