--- a/src/pt-check.cc
+++ b/src/pt-check.cc
@@ -40,10 +40,10 @@
       tree_expression *elt = *p++;
 
       if (elt)
-	{
-	  if (do_lvalue_check && ! elt->lvalue_ok ())
-	    gripe ("invalid lvalue in multiple assignment", elt->line ());
-	}
+        {
+          if (do_lvalue_check && ! elt->lvalue_ok ())
+            gripe ("invalid lvalue in multiple assignment", elt->line ());
+        }
     }
 }
 
@@ -135,7 +135,7 @@
       tree_decl_elt *elt = *p++;
 
       if (elt)
-	elt->accept (*this);
+        elt->accept (*this);
     }
 }
 
@@ -147,7 +147,7 @@
   if (lhs)
     {
       if (! lhs->lvalue_ok ())
-	gripe ("invalid lvalue in for command", cmd.line ());
+        gripe ("invalid lvalue in for command", cmd.line ());
     }
 
   tree_expression *expr = cmd.control_expr ();
@@ -171,8 +171,8 @@
       int len = lhs->length ();
 
       if (len == 0 || len > 2)
-	gripe ("invalid number of output arguments in for command",
-	       cmd.line ());
+        gripe ("invalid number of output arguments in for command",
+               cmd.line ());
 
       do_lvalue_check = true;
 
@@ -259,7 +259,7 @@
       tree_if_clause *elt = *p++;
 
       if (elt)
-	elt->accept (*this);
+        elt->accept (*this);
     }
 }
 
@@ -280,7 +280,7 @@
       tree_argument_list *elt = *p++;
 
       if (elt)
-	elt->accept (*this);
+        elt->accept (*this);
     }
 }
 
@@ -294,7 +294,7 @@
       tree_argument_list *elt = *p++;
 
       if (elt)
-	elt->accept (*this);
+        elt->accept (*this);
     }
 }
 
@@ -308,7 +308,7 @@
       tree_argument_list *elt = *p++;
 
       if (elt)
-	elt->accept (*this);
+        elt->accept (*this);
     }
 }
 
@@ -362,7 +362,7 @@
       tree_decl_elt *elt = *p++;
 
       if (elt)
-	elt->accept (*this);
+        elt->accept (*this);
     }
 }
 
@@ -399,7 +399,7 @@
       tree_index_expression *elt = *p++;
 
       if (elt)
-	elt->accept (*this);
+        elt->accept (*this);
     }
 }
 
@@ -411,7 +411,7 @@
   if (lhs)
     {
       if (! lhs->lvalue_ok ())
-	gripe ("invalid lvalue in assignment", expr.line ());
+        gripe ("invalid lvalue in assignment", expr.line ());
     }
 
   tree_expression *rhs = expr.right_hand_side ();
@@ -432,7 +432,7 @@
       tree_expression *expr = stmt.expression ();
 
       if (expr)
-	expr->accept (*this);
+        expr->accept (*this);
     }
 }
 
@@ -444,7 +444,7 @@
       tree_statement *elt = *p;
 
       if (elt)
-	elt->accept (*this);
+        elt->accept (*this);
     }
 }
 
@@ -472,7 +472,7 @@
       tree_switch_case *elt = *p++;
 
       if (elt)
-	elt->accept (*this);
+        elt->accept (*this);
     }
 }