diff --git a/compiler/fppu.pas b/compiler/fppu.pas
index 6b0b9a8403..44f5aca528 100644
--- a/compiler/fppu.pas
+++ b/compiler/fppu.pas
@@ -174,6 +174,7 @@ var
            ppufile:=nil;
          end;
         freederefunitimportsyms;
+        unitimportsymsderefs.free;
         unitimportsymsderefs:=tfplist.create;
         inherited reset;
       end;