diff --git a/Makefile b/Makefile
index 49e83d21c..aa96c3282 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,7 @@ ifndef COVERAGE
   CFLAGS   += -O2
   CXXFLAGS += -O2
   LDFLAGS  += -O2
+  MAKEFLAGS += "-j 0"
 else
   CFLAGS   += -O1 -fno-omit-frame-pointer
   CXXFLAGS += -O1 -fno-omit-frame-pointer