diff --git a/client/Makefile b/client/Makefile
index 3c7a33fdd..96920229e 100644
--- a/client/Makefile
+++ b/client/Makefile
@@ -7,7 +7,7 @@ include ../common/Makefile.common
 
 CC = gcc
 CXX = g++
-COMMON_FLAGS += -std=c99 -O3 -mpopcnt -march=native -g
+COMMON_FLAGS += -std=c99 -O3 -march=native -g
 
 #VPATH = ../common ../zlib
 OBJDIR = obj