diff --git a/cores/c64/C64_mist.qsf b/cores/c64/C64_mist.qsf
index 6115a4e..f6cb971 100644
--- a/cores/c64/C64_mist.qsf
+++ b/cores/c64/C64_mist.qsf
@@ -165,7 +165,7 @@ set_global_assignment -name USE_CONFIGURATION_DEVICE OFF
 
 # SignalTap II Assignments
 # ========================
-set_global_assignment -name ENABLE_SIGNALTAP ON
+set_global_assignment -name ENABLE_SIGNALTAP OFF
 set_global_assignment -name USE_SIGNALTAP_FILE stp1.stp
 
 # Power Estimation Assignments