diff --git a/opt-pilot/Expression/RadialPeak.h b/opt-pilot/Expression/RadialPeak.h
index 2e1f1e16ff89efbb8293c1b83490f780c3d588f4..0eb3e58236c2a28cebbfdf3158fad526ae5c1ea4 100644
--- a/opt-pilot/Expression/RadialPeak.h
+++ b/opt-pilot/Expression/RadialPeak.h
@@ -55,10 +55,19 @@ private:
 
     // define a mapping to arguments in argument vector
     boost::tuple<std::string, int> argument_types;
+    // :FIXME: remove unused enum
+#if 0
     enum {
           peak_filename
         , turn_number
     } argument_type_id;
+#endif
 };
 
 #endif
+// vi: set et ts=4 sw=4 sts=4:
+// Local Variables:
+// mode:c
+// c-basic-offset: 4
+// indent-tabs-mode:nil
+// End:
diff --git a/opt-pilot/Expression/SumErrSq.h b/opt-pilot/Expression/SumErrSq.h
index a44c5a0b21adc2f1e2ebb04c3907f04c3bdb813b..78bee918dd10d1f570e916f5e4ac98245a02def7 100644
--- a/opt-pilot/Expression/SumErrSq.h
+++ b/opt-pilot/Expression/SumErrSq.h
@@ -85,12 +85,14 @@ private:
 
     // define a mapping to arguments in argument vector
     boost::tuple<std::string, std::string, std::string> argument_types;
+    // :FIXME: unused enum
+#if 0
     enum {
           measurement_filename
         , var_name
         , stat_filename
     } argument_type_id;
-
+#endif
 };
 
 #endif
diff --git a/opt-pilot/Expression/SumErrSqRadialPeak.h b/opt-pilot/Expression/SumErrSqRadialPeak.h
index 865b32192562c04c9f7d4528c3b0fe1a3f39941b..c1734b9398f0174c02753bcc9371e9843efb84e2 100644
--- a/opt-pilot/Expression/SumErrSqRadialPeak.h
+++ b/opt-pilot/Expression/SumErrSqRadialPeak.h
@@ -79,13 +79,21 @@ private:
 
     // define a mapping to arguments in argument vector
     boost::tuple<std::string, std::string, int, int> argument_types;
+    // :FIXME: remove unused enum
+#if 0
     enum {
           meas_filename
         , sim_filename
         , begin
         , end
     } argument_type_id;
-
+#endif
 };
 
 #endif
+// vi: set et ts=4 sw=4 sts=4:
+// Local Variables:
+// mode:c
+// c-basic-offset: 4
+// indent-tabs-mode:nil
+// End: