diff --git a/Components/9918/9918.cpp b/Components/9918/9918.cpp
index c09deaa9f..e99a4dcaa 100644
--- a/Components/9918/9918.cpp
+++ b/Components/9918/9918.cpp
@@ -99,6 +99,12 @@ TMS9918::TMS9918(Personality p) {
 	crt_->set_output_device(Outputs::CRT::OutputDevice::Monitor);
 	crt_->set_visible_area(Outputs::CRT::Rect(0.055f, 0.025f, 0.9f, 0.9f));
 	crt_->set_input_gamma(2.8f);
+
+	// The TMS remains in-phase with the NTSC colour clock; this is an empirical measurement
+	// intended to produce the correct relationship between the hard edges between pixels and
+	// the colour clock. It was eyeballed rather than derived from any knowledge of the TMS
+	// colour burst generator because I've yet to find any.
+	crt_->set_immediate_default_phase(0.85f);
 }
 
 Outputs::CRT::CRT *TMS9918::get_crt() {
diff --git a/Outputs/CRT/CRT.cpp b/Outputs/CRT/CRT.cpp
index 2e1fb5c65..82f582f6b 100644
--- a/Outputs/CRT/CRT.cpp
+++ b/Outputs/CRT/CRT.cpp
@@ -379,6 +379,11 @@ void CRT::output_default_colour_burst(unsigned int number_of_cycles) {
 	output_colour_burst(number_of_cycles, static_cast<uint8_t>((phase_numerator_ * 256) / phase_denominator_ + (is_alernate_line_ ? 128 : 0)));
 }
 
+void CRT::set_immediate_default_phase(float phase) {
+	phase = fmodf(phase, 1.0f);
+	phase_numerator_ = static_cast<unsigned int>(phase * static_cast<float>(phase_denominator_));
+}
+
 void CRT::output_data(unsigned int number_of_cycles, unsigned int source_divider) {
 	openGL_output_builder_.texture_builder.reduce_previous_allocation_to(number_of_cycles / source_divider);
 	Scan scan;
diff --git a/Outputs/CRT/CRT.hpp b/Outputs/CRT/CRT.hpp
index 521f1833b..90367a174 100644
--- a/Outputs/CRT/CRT.hpp
+++ b/Outputs/CRT/CRT.hpp
@@ -210,6 +210,13 @@ class CRT {
 		*/
 		void output_default_colour_burst(unsigned int number_of_cycles);
 
+		/*! Sets the current phase of the colour subcarrier used by output_default_colour_burst.
+
+			@param phase The normalised instantaneous phase — 0.0f is the start of a colour cycle, 1.0f is the
+			end of a colour cycle, 0.25f is a quarter of the way through a colour cycle, etc.
+		*/
+		void set_immediate_default_phase(float phase);
+
 		/*!	Attempts to allocate the given number of output samples for writing.
 
 			The beginning of the most recently allocated area is used as the start