diff --git a/configure b/configure
index 926a38cd0..f40bad7b4 100755
--- a/configure
+++ b/configure
@@ -5258,7 +5258,7 @@ else $as_nop
 
 	# Otherwise use the Fortify enhancements to catch any unbounded
 	# string operations...
-	CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=2"
+	CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=3"
 
 fi
 
diff --git a/configure.ac b/configure.ac
index 31b4da3a2..40bffdb44 100644
--- a/configure.ac
+++ b/configure.ac
@@ -488,7 +488,7 @@ AS_IF([test -n "$GCC"], [
     ], [
 	# Otherwise use the Fortify enhancements to catch any unbounded
 	# string operations...
-	CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=2"
+	CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=3"
     ])
 
     dnl Show all standard warnings + unused variables when compiling...