diff --git a/libburn/trunk/configure.ac b/libburn/trunk/configure.ac
index f3a48823..8b17b815 100644
--- a/libburn/trunk/configure.ac
+++ b/libburn/trunk/configure.ac
@@ -296,7 +296,7 @@ if test x$enable_debug != xyes; then
     CFLAGS="-DNDEBUG $CFLAGS"
 else
     if test x$GCC = xyes; then
-        CFLAGS="-g -pedantic -Wall $CFLAGS"
+        CFLAGS="-g -pedantic -Wall -Wextra -Wno-unused-parameter $CFLAGS"
     fi
     CFLAGS="-DDEBUG $CFLAGS"
 fi