diff --git a/keyboards/bastardkb/dilemma/3x5_3/config.h b/keyboards/bastardkb/dilemma/3x5_3/config.h
index ccbc4e2f5895..9cda8ece0786 100644
--- a/keyboards/bastardkb/dilemma/3x5_3/config.h
+++ b/keyboards/bastardkb/dilemma/3x5_3/config.h
@@ -120,3 +120,6 @@
 #    define ENABLE_RGB_MATRIX_SOLID_SPLASH
 #    define ENABLE_RGB_MATRIX_SOLID_MULTISPLASH
 #endif
+
+// Reduce soft serial speed: Work around rp2040 issues
+#define SELECT_SOFT_SERIAL_SPEED 4
diff --git a/keyboards/bastardkb/dilemma/4x6_4/config.h b/keyboards/bastardkb/dilemma/4x6_4/config.h
index 9c76cb76f9e0..21bdbf69d3e9 100644
--- a/keyboards/bastardkb/dilemma/4x6_4/config.h
+++ b/keyboards/bastardkb/dilemma/4x6_4/config.h
@@ -52,3 +52,6 @@
 // Startup values.
 #define RGB_MATRIX_DEFAULT_VAL 64
 #define RGB_MATRIX_DEFAULT_SPD 32
+
+// Reduce soft serial speed: Work around rp2040 issues
+#define SELECT_SOFT_SERIAL_SPEED 4