diff --git a/libs/js/nsprpub/config/rules.mk b/libs/js/nsprpub/config/rules.mk
index 1cbb70dbb1..42781421fd 100644
--- a/libs/js/nsprpub/config/rules.mk
+++ b/libs/js/nsprpub/config/rules.mk
@@ -232,7 +232,7 @@ install:: $(RELEASE_BINS) $(RELEASE_HEADERS) $(RELEASE_LIBS)
 #	$(NSINSTALL) -t -m 0644 $(RELEASE_HEADERS) $(DESTDIR)$(includedir)/$(include_subdir)
 #endif
 ifdef RELEASE_LIBS
-	$(NSINSTALL) -t -m 0755 $(RELEASE_LIBS) $(DESTDIR)$(libdir)/$(lib_subdir)
+	$(NSINSTALL) -t -m 0755 $(RELEASE_LIBS) $(DESTDIR)$(prefix)/$(lib_subdir)
 endif
 	+$(LOOP_OVER_DIRS)