diff --git a/usr.bin/lex/flex.skl b/usr.bin/lex/flex.skl
index 69d9ca2cac4..ac8eac2d9c3 100644
--- a/usr.bin/lex/flex.skl
+++ b/usr.bin/lex/flex.skl
@@ -747,7 +747,11 @@ void yyFlexLexer::LexerOutput( const char* buf, int size )
  */
 
 %-
+#ifdef YY_USE_PROTOS
 static int yy_get_next_buffer(void)
+#else
+static int yy_get_next_buffer()
+#endif
 %+
 int yyFlexLexer::yy_get_next_buffer()
 %*
@@ -883,7 +887,11 @@ int yyFlexLexer::yy_get_next_buffer()
 /* yy_get_previous_state - get the state just before the EOB char was reached */
 
 %-
+#ifdef YY_USE_PROTOS
 static yy_state_type yy_get_previous_state(void)
+#else
+static yy_state_type yy_get_previous_state()
+#endif
 %+
 yy_state_type yyFlexLexer::yy_get_previous_state()
 %*
@@ -983,7 +991,11 @@ void yyFlexLexer::yyunput( int c, char* yy_bp )
 #ifdef __cplusplus
 static int yyinput()
 #else
+#ifdef YY_USE_PROTOS
 static int input(void)
+#else
+static int input()
+#endif
 #endif
 %+
 int yyFlexLexer::yyinput()
@@ -1055,7 +1067,9 @@ int yyFlexLexer::yyinput()
 
 	return c;
 	}
-#endif /* ifndef YY_NO_INPUT */
+%-
+#endif	/* ifndef YY_NO_INPUT */
+%*
 
 
 %-
@@ -1404,7 +1418,11 @@ void yyFlexLexer::yy_push_state( int new_state )
 
 #ifndef YY_NO_POP_STATE
 %-
+#ifdef YY_USE_PROTOS
+static void yy_pop_state(void)
+#else
 static void yy_pop_state()
+#endif
 %+
 void yyFlexLexer::yy_pop_state()
 %*
@@ -1419,7 +1437,11 @@ void yyFlexLexer::yy_pop_state()
 
 #ifndef YY_NO_TOP_STATE
 %-
+#ifdef YY_USE_PROTOS
+static int yy_top_state(void)
+#else
 static int yy_top_state()
+#endif
 %+
 int yyFlexLexer::yy_top_state()
 %*