diff --git a/tcl/target/stm32f4x.cfg b/tcl/target/stm32f4x.cfg
index c7f6ee817..7205c4614 100644
--- a/tcl/target/stm32f4x.cfg
+++ b/tcl/target/stm32f4x.cfg
@@ -120,3 +120,8 @@ $_TARGETNAME configure -event reset-init {
 	# Boost JTAG frequency
 	adapter_khz 8000
 }
+
+$_TARGETNAME configure -event reset-start {
+	# Reduce speed since CPU speed will slow down to 16MHz with the reset
+	adapter_khz 2000
+}