diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 1a08ea47fdd..b1d41b20a59 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3212,6 +3212,7 @@ opt_by:		BY				{}
 
 NumericOnly:
 			FCONST								{ $$ = makeFloat($1); }
+			| '+' FCONST						{ $$ = makeFloat($2); }
 			| '-' FCONST
 				{
 					$$ = makeFloat($2);