Index: gcc/fortran/io.c
===================================================================
--- gcc/fortran/io.c	(revision 223094)
+++ gcc/fortran/io.c	(working copy)
@@ -2382,9 +2382,7 @@ match_filepos (gfc_statement st, gfc_exe
   if (m == MATCH_NO)
     {
       m = gfc_match_expr (&fp->unit);
-      if (m == MATCH_ERROR)
-	goto done;
-      if (m == MATCH_NO)
+      if (m == MATCH_ERROR || m == MATCH_NO)
 	goto syntax;
     }
 
Index: gcc/testsuite/gfortran.dg/filepos1.f90
===================================================================
--- gcc/testsuite/gfortran.dg/filepos1.f90	(revision 0)
+++ gcc/testsuite/gfortran.dg/filepos1.f90	(working copy)
@@ -0,0 +1,25 @@
+! { dg-do compile }
+! PR fortran/66039
+!
+! Original code from Gerhard Steinmetz
+! <gerhard dot steinmetz dot fortran at t-online dot de>
+subroutine p1
+   rewind ((     ! { dg-error "Syntax error in REWIND" }
+   rewind (-     ! { dg-error "Syntax error in REWIND" }
+end subroutine p1
+
+subroutine p2
+   flush ((      ! { dg-error "Syntax error in FLUSH" }
+   flush (-      ! { dg-error "Syntax error in FLUSH" }
+end subroutine p2
+
+subroutine p4
+   backspace ((   ! { dg-error "Syntax error in BACKSPACE" }
+   backspace (-   ! { dg-error "Syntax error in BACKSPACE" }
+end subroutine p4
+
+subroutine p3
+   endfile ((     ! { dg-error "Expecting END SUBROUTINE" }
+   endfile (-     ! { dg-error "Expecting END SUBROUTINE" }
+end subroutine p3
+