diff --git a/Makefile b/Makefile
index 50e45425ec..3e61a30f77 100644
--- a/Makefile
+++ b/Makefile
@@ -123,6 +123,7 @@ endif
 
 # Check code syntax with host compiler
 CC_CHECK_WARNINGS := -Wall -Wextra -Wno-unknown-pragmas -Wno-unused-parameter -Wno-unused-variable -Wno-missing-braces -Wno-unused-but-set-variable -Wno-unused-label -Wno-sign-compare -Wno-tautological-compare
+CC_CHECK_WARNINGS += -Werror=implicit-int -Werror=implicit-function-declaration -Werror=int-conversion -Werror=incompatible-pointer-types
 # Have CC_CHECK pretend to be a MIPS compiler
 MIPS_BUILTIN_DEFS := -DMIPSEB -D_MIPS_FPSET=16 -D_MIPS_ISA=2 -D_ABIO32=1 -D_MIPS_SIM=_ABIO32 -D_MIPS_SZINT=32 -D_MIPS_SZPTR=32
 # The -MMD flags additionaly creates a .d file with the same name as the .o file.