diff --git a/FlightGear-files.iss b/FlightGear-files.iss
index d129b71..802ff61 100644
--- a/FlightGear-files.iss
+++ b/FlightGear-files.iss
@@ -31,7 +31,7 @@ Source: "{#ThirdPartyDir}\3rdParty.x64\bin\liblzma.dll"; DestDir: "{app}\bin"; C
 
 ; Include the base package
 #if IncludeData == "TRUE"
-Source: "{#FgHarnessPath}\fgdata\*.*"; DestDir: "{app}\data"; Flags: ignoreversion recursesubdirs skipifsourcedoesntexist
+Source: "{#FgHarnessPath}\fgdata\*.*"; DestDir: "{app}\data"; Excludes: "{#FGDataExcludes}"; Flags: ignoreversion recursesubdirs skipifsourcedoesntexist
 #endif
 
 ; 32 bits install
diff --git a/FlightGear.iss b/FlightGear.iss
index 09092f0..bc73821 100644
--- a/FlightGear.iss
+++ b/FlightGear.iss
@@ -61,6 +61,9 @@
 ; useful to the end-user to ship
 #define ExcludedBinaries "*smooth.exe,metar.exe"
 
+; Exclude XCF files from FGData to keep the size down
+#define FGDataExcludes "*.xcf"
+
 #include "FlightGear-files.iss"
 
 [Setup]