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-rw-r--r--Makeconfig2
1 files changed, 1 insertions, 1 deletions
diff --git a/Makeconfig b/Makeconfig
index cef0f06b64..0f8069b82a 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -717,7 +717,7 @@ else
 +gccwarn := -Wall -Wwrite-strings -Winline
 endif
 +gccwarn += -Wundef
-+gccwarn-c = -Wstrict-prototypes
++gccwarn-c = -Wstrict-prototypes -Werror=implicit-function-declaration
 
 # We do not depend on the address of constants in different files to be
 # actually different, so allow the compiler to merge them all.