--- a/memory/jemalloc/Makefile.in
+++ b/memory/jemalloc/Makefile.in
@@ -87,16 +87,17 @@ LIBRARY_NAME	= jemalloc
 
 ifeq (Darwin,$(OS_TARGET))
 # Build jemalloc as a shared lib, so that the library init function is executed.
 FORCE_SHARED_LIB= 1
 else
 # Make jemalloc part of libxul, in order to reduce dynamic loading overhead.
 MODULE		= jemalloc
 LIBXUL_LIBRARY	= 1
+FORCE_STATIC_LIB = 1
 endif
 
 CSRCS		= \
 		jemalloc.c \
 		$(NULL)
 
 #XXX: PGO on Linux causes problems here
 # See bug 419470