diff --git a/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h b/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h
index d5aed05b9..932c5c2b1 100644
--- a/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h
+++ b/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h
@@ -163,4 +163,4 @@ enum CLKINDEX { RUN_CLK, ADC_CLK, SYNC_CLK, DBIT_CLK, GATED_CLK, NUM_CLOCKS };
 
 #define MAXIMUM_ADC_CLK    (65)
 #define PLL_VCO_FREQ_MHZ   (800)
-#define PLL_A_VCO_FREQ_MHZ (400)
+#define PLL_A_VCO_FREQ_MHZ (800)