diff --git a/src/GlueXSensitiveDetectorFDC.hh b/src/GlueXSensitiveDetectorFDC.hh
index 5b0af62..6f49d69 100644
--- a/src/GlueXSensitiveDetectorFDC.hh
+++ b/src/GlueXSensitiveDetectorFDC.hh
@@ -71,10 +71,10 @@ class GlueXSensitiveDetectorFDC : public G4VSensitiveDetector
    static int    WIRES_PER_PLANE;
    static double WIRE_SPACING;
    static double STRIP_SPACING;
-   static double U_OF_WIRE_ZERO;
+   static double U_OF_WIRE_ONE;
    static int    STRIPS_PER_PLANE;
    static double CATHODE_ROT_ANGLE;
-   static double U_OF_STRIP_ZERO;
+   static double U_OF_STRIP_ONE;
    static double STRIP_GAP;
    static double K2;
    static double STRIP_NODES;