diff --git a/common/windows/delphi/Defines.mak b/common/windows/delphi/Defines.mak
index 280fc59aa8..81ce4b5596 100644
--- a/common/windows/delphi/Defines.mak
+++ b/common/windows/delphi/Defines.mak
@@ -187,8 +187,13 @@ WIXLIGHTLINT= -sice:ICE82 -sice:ICE80
 # for debug builds, we turn off compression because it is so hideously slow
 WIXLIGHTCOMPRESSION=-dcl:none
 !ELSE
+!IF "$(VERSION_ENVIRONMENT)" == "test"
+# for test builds, we also turn off compression
+WIXLIGHTCOMPRESSION=-dcl:none
+!ELSE
 WIXLIGHTCOMPRESSION=
 !ENDIF
+!ENDIF
 
 WIXLIGHT=$(WIXPATH)\light.exe -wx -nologo $(WIXLIGHTLINT) $(WIXLIGHTCOMPRESSION)
 
diff --git a/windows/src/Defines.mak b/windows/src/Defines.mak
index 8185a4cddc..fb743b8b2d 100644
--- a/windows/src/Defines.mak
+++ b/windows/src/Defines.mak
@@ -210,8 +210,13 @@ WIXLIGHTLINT= -sice:ICE82 -sice:ICE80
 # for debug builds, we turn off compression because it is so hideously slow
 WIXLIGHTCOMPRESSION=-dcl:none
 !ELSE
+!IF "$(VERSION_ENVIRONMENT)" == "test"
+# for test builds, we also turn off compression
+WIXLIGHTCOMPRESSION=-dcl:none
+!ELSE
 WIXLIGHTCOMPRESSION=
 !ENDIF
+!ENDIF
 
 WIXLIGHT=$(WIXPATH)\light.exe -wx -nologo $(WIXLIGHTLINT) $(WIXLIGHTCOMPRESSION)
 WIXLIT=$(WIXPATH)\lit.exe -wx -nologo