diff --git a/test/lgf_test.cc b/test/lgf_test.cc
--- a/test/lgf_test.cc
+++ b/test/lgf_test.cc
@@ -117,7 +117,7 @@
       digraphReader(d, input).
         run();
     }
-    catch (FormatError& error) 
+    catch (FormatError&) 
       {
         ok = true;
       }
@@ -131,7 +131,7 @@
       graphReader(g, input).
         run();
     }
-    catch (FormatError& error)
+    catch (FormatError&)
       {
         ok = true;
       }
@@ -146,7 +146,7 @@
       digraphReader(d, input).
         run();
     }
-    catch (FormatError& error)
+    catch (FormatError&)
       {
         ok = true;
       }
@@ -160,7 +160,7 @@
       graphReader(g, input).
         run();
     }
-    catch (FormatError& error)
+    catch (FormatError&)
       {
         ok = true;
       }