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-rw-r--r--Source/Parser/wp_parser.l2
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/Parser/wp_parser.l b/Source/Parser/wp_parser.l
index e8c99200d..9c54ab06c 100644
--- a/Source/Parser/wp_parser.l
+++ b/Source/Parser/wp_parser.l
@@ -50,7 +50,7 @@ EXP ([Ee][-+]?[0-9]+)
"max" { yylval.f2 = WP_MAX; return F2; }
/* We use SYMBOL to hold variables and constants */
-[a-zA-Z][a-zA-Z0-9]* { yylval.s = wp_makesymbol(yytext); return SYMBOL; }
+[a-zA-Z_][a-zA-Z0-9_]* { yylval.s = wp_makesymbol(yytext); return SYMBOL; }
/* Number */
[0-9]+"."[0-9]*{EXP}? |