diff --git a/makefiles/toolchain_gnu-arm-eabi.mk b/makefiles/toolchain_gnu-arm-eabi.mk
index bb729e1032..4ca2443c5e 100644
--- a/makefiles/toolchain_gnu-arm-eabi.mk
+++ b/makefiles/toolchain_gnu-arm-eabi.mk
@@ -125,7 +125,11 @@ ARCHWARNINGS		 = -Wall \
 			   -Wlogical-op \
 			   -Wmissing-declarations \
 			   -Wpacked \
-			   -Wno-unused-parameter
+			   -Wno-unused-parameter \
+			   -Werror=format-security \
+			   -Werror=array-bounds \
+			   -Wfatal-errors \
+			   -Wformat=1
 #   -Wcast-qual  - generates spurious noreturn attribute warnings, try again later
 #   -Wconversion - would be nice, but too many "risky-but-safe" conversions in the code
 #   -Wcast-align - would help catch bad casts in some cases, but generates too many false positives