diff --git a/configure.ac b/configure.ac
index 77c72be5..354b9c51 100644
--- a/configure.ac
+++ b/configure.ac
@@ -306,13 +306,17 @@ PA_ARG_ENABLED([werror],
   PA_ADD_CFLAGS([-Werror=return-type])
   PA_ADD_CFLAGS([-Werror=trigraphs])
   PA_ADD_CFLAGS([-Werror=pointer-arith])
-  PA_ADD_CFLAGS([-Werror=strict-prototypes])
-  PA_ADD_CFLAGS([-Werror=missing-prototypes])
-  PA_ADD_CFLAGS([-Werror=missing-declarations])
   PA_ADD_CFLAGS([-Werror=comment])
   PA_ADD_CFLAGS([-Werror=vla])]
 )
 
+dnl These warnings are apparently not included in -Wall -W -pedantic
+dnl for some bizarre reason. They are, however, absolutely forbidden
+dnl in this code base.
+PA_ADD_CFLAGS([-Werror=strict-prototypes])
+PA_ADD_CFLAGS([-Werror=missing-prototypes])
+PA_ADD_CFLAGS([-Werror=missing-declarations])
+
 dnl Variadic macros are used in this code, but only under explicit guard
 PA_ADD_CFLAGS([-Wvariadic-macros],[-Wno-variadic-macros])
 dnl Suppress format warning on Windows targets due to their <inttypes.h>