diff --git a/Makefile b/Makefile
index e39169edb..78ee75e0a 100644
--- a/Makefile
+++ b/Makefile
@@ -81,7 +81,7 @@ CPPFLAGS  += -g3
 CPPFLAGS  += -Os
 
 CFLAGS    += $(CPPFLAGS)
-CFLAGS    += -Wall -Wextra -Werror -Wswitch-enum -Wno-unused-parameter -Wno-inconsistent-missing-override -Wno-missing-braces -Wno-unused-lambda-capture
+CFLAGS    += -Wall -Wextra -Werror -Wswitch-enum -Wno-unused-parameter -Wno-inconsistent-missing-override -Wno-missing-braces -Wno-unused-lambda-capture -Wno-sign-compare
 
 CXXFLAGS  += $(CFLAGS) -MMD
 
diff --git a/platformio.ini b/platformio.ini
index 7f1e6f02b..3591281d9 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -158,7 +158,7 @@ build_flags =
 	-lpthread
   -std=gnu++11 -Og -ggdb
 build_src_flags =
-  -Wall -Wextra -Werror -Wswitch-enum -Wno-unused-parameter -Wno-inconsistent-missing-override -Wno-unused-lambda-capture
+  -Wall -Wextra -Werror -Wswitch-enum -Wno-unused-parameter -Wno-inconsistent-missing-override -Wno-unused-lambda-capture -Wno-sign-compare
   -Wno-missing-braces
   -I./lib_standalone
   -I./lib/ArduinoJson/src