diff --git a/src/dmdreader.cpp b/src/dmdreader.cpp
index 74311b3..fb5f8b4 100644
--- a/src/dmdreader.cpp
+++ b/src/dmdreader.cpp
@@ -348,9 +348,9 @@ DmdType detect_dmd() {
              (rclk < 2050) && (rdata > 55) && (rdata < 65)) {
     return DMD_SAM;
 
-    // WPC: DOTCLK: 500000 | RCLK: 3900 | RDATA: 120
+    // WPC: DOTCLK: 500000 | RCLK: 3900 | RDATA: 120 (doubled in some cases)
   } else if ((dotclk > 450000) && (dotclk < 550000) && (rclk > 3800) &&
-             (rclk < 4000) && (rdata > 115) && (rdata < 130)) {
+             (rclk < 4000) && (rdata > 115) && (rdata < 260)) {
     return DMD_WPC;
 
     // DOTMATION: DOTCLK: 1900000 | RCLK: 9950 | RDATA: 155