--- a/toolkit/mozapps/installer/upload-files.mk
+++ b/toolkit/mozapps/installer/upload-files.mk
@@ -330,16 +330,19 @@ ifndef MOZ_PKG_MANIFEST
 endif # MOZ_PKG_MANIFEST
 
 ifndef MOZ_PACKAGER_FORMAT
   MOZ_PACKAGER_FORMAT = $(error MOZ_PACKAGER_FORMAT is not set)
 endif
 
 ifneq (android,$(MOZ_WIDGET_TOOLKIT))
   OPTIMIZEJARS = 1
+  ifneq (gonk,$(MOZ_WIDGET_TOOLKIT))
+    DISABLE_JAR_COMPRESSION = 1
+  endif
 endif
 
 # A js binary is needed to perform verification of JavaScript minification.
 # We can only use the built binary when not cross-compiling. Environments
 # (such as release automation) can provide their own js binary to enable
 # verification when cross-compiling.
 ifndef JS_BINARY
   ifndef CROSS_COMPILE