diff --git a/prism/prism.c b/prism/prism.c
index 15c793f08b..b2d7373e65 100644
--- a/prism/prism.c
+++ b/prism/prism.c
@@ -14316,7 +14316,7 @@ parse_expression_prefix(pm_parser_t *parser, pm_binding_power_t binding_power, b
                 match1(parser, PM_TOKEN_PARENTHESIS_LEFT) ||
                 (accepts_command_call && (token_begins_expression_p(parser->current.type) || match3(parser, PM_TOKEN_UAMPERSAND, PM_TOKEN_USTAR, PM_TOKEN_USTAR_STAR))) ||
                 (pm_accepts_block_stack_p(parser) && match1(parser, PM_TOKEN_KEYWORD_DO)) ||
-		match1(parser, PM_TOKEN_BRACE_LEFT)
+                match1(parser, PM_TOKEN_BRACE_LEFT)
             ) {
                 pm_arguments_t arguments = { 0 };
                 parse_arguments_list(parser, &arguments, true, accepts_command_call);
@@ -14441,7 +14441,7 @@ parse_expression_prefix(pm_parser_t *parser, pm_binding_power_t binding_power, b
                 if (
                     (accepts_command_call && (token_begins_expression_p(parser->current.type) || match3(parser, PM_TOKEN_UAMPERSAND, PM_TOKEN_USTAR, PM_TOKEN_USTAR_STAR))) ||
                     (pm_accepts_block_stack_p(parser) && match1(parser, PM_TOKEN_KEYWORD_DO)) ||
-		    match1(parser, PM_TOKEN_BRACE_LEFT)
+                    match1(parser, PM_TOKEN_BRACE_LEFT)
                 ) {
                     pm_arguments_t arguments = { 0 };
                     parse_arguments_list(parser, &arguments, true, accepts_command_call);