diff --git a/firmware/common/hackrf_ui.c b/firmware/common/hackrf_ui.c
index 23541e7c..39518f60 100644
--- a/firmware/common/hackrf_ui.c
+++ b/firmware/common/hackrf_ui.c
@@ -42,6 +42,7 @@ void hackrf_ui_set_first_if_frequency_null(const uint64_t frequency) { UNUSED(fr
 void hackrf_ui_set_filter_null(const rf_path_filter_t filter) { UNUSED(filter); }
 void hackrf_ui_set_antenna_bias_null(bool antenna_bias) { UNUSED(antenna_bias); }
 void hackrf_ui_set_clock_source_null(clock_source_t source) { UNUSED(source); }
+bool hackrf_ui_operacake_gpio_compatible_null(void) { return true; }
 
 /* Null UI function table, used if there's no hardware UI detected. Eliminates the
  * need to check for null UI before calling a function in the table.
@@ -60,6 +61,7 @@ static const hackrf_ui_t hackrf_ui_null = {
 	&hackrf_ui_set_filter_null,
 	&hackrf_ui_set_antenna_bias_null,
 	&hackrf_ui_set_clock_source_null,
+	&hackrf_ui_operacake_gpio_compatible_null
 };
 
 static const hackrf_ui_t* ui = NULL;
diff --git a/firmware/common/hackrf_ui.h b/firmware/common/hackrf_ui.h
index 5ac07ada..a3252b54 100644
--- a/firmware/common/hackrf_ui.h
+++ b/firmware/common/hackrf_ui.h
@@ -38,6 +38,7 @@ typedef void (*hackrf_ui_set_first_if_frequency_fn)(const uint64_t frequency);
 typedef void (*hackrf_ui_set_filter_fn)(const rf_path_filter_t filter);
 typedef void (*hackrf_ui_set_antenna_bias_fn)(bool antenna_bias);
 typedef void (*hackrf_ui_set_clock_source_fn)(clock_source_t source);
+typedef bool (*hackrf_ui_operacake_gpio_compatible_fn)(void);
 
 typedef struct {
 	hackrf_ui_init_fn init;
@@ -53,6 +54,7 @@ typedef struct {
 	hackrf_ui_set_filter_fn set_filter;
 	hackrf_ui_set_antenna_bias_fn set_antenna_bias;
 	hackrf_ui_set_clock_source_fn set_clock_source;
+	hackrf_ui_operacake_gpio_compatible_fn operacake_gpio_compatible;
 } hackrf_ui_t;
 
 /* TODO: Lame hack to know that PortaPack was detected.
diff --git a/firmware/common/ui_portapack.c b/firmware/common/ui_portapack.c
index d9dc90da..24383b7d 100644
--- a/firmware/common/ui_portapack.c
+++ b/firmware/common/ui_portapack.c
@@ -549,6 +549,10 @@ static void portapack_ui_set_clock_source(clock_source_t source) {
 	portapack_lcd_draw_string(label_point, s);
 }
 
+static bool portapack_ui_operacake_gpio_compatible(void) {
+	return false;
+}
+
 const hackrf_ui_t portapack_hackrf_ui = {
 	&portapack_ui_init,
 	&portapack_ui_set_frequency,
@@ -563,6 +567,7 @@ const hackrf_ui_t portapack_hackrf_ui = {
 	&portapack_ui_set_filter,
 	&portapack_ui_set_antenna_bias,
 	&portapack_ui_set_clock_source,
+	&portapack_ui_operacake_gpio_compatible,
 };
 
 const hackrf_ui_t* portapack_hackrf_ui_init() {
diff --git a/firmware/common/ui_rad1o.c b/firmware/common/ui_rad1o.c
index af4e4fb8..d94fb53b 100644
--- a/firmware/common/ui_rad1o.c
+++ b/firmware/common/ui_rad1o.c
@@ -88,6 +88,10 @@ static void rad1o_ui_set_clock_source(clock_source_t source) {
 	hackrf_ui_setClockSource(source);
 }
 
+static bool rad1o_ui_operacake_gpio_compatible(void) {
+	return true;
+}
+
 static const hackrf_ui_t rad1o_ui = {
 	&rad1o_ui_init,
 	&rad1o_ui_set_frequency,
@@ -102,6 +106,7 @@ static const hackrf_ui_t rad1o_ui = {
 	&rad1o_ui_set_filter,
 	&rad1o_ui_set_antenna_bias,
 	&rad1o_ui_set_clock_source,
+	&rad1o_ui_operacake_gpio_compatible,
 };
 
 const hackrf_ui_t* rad1o_ui_setup(void) {
diff --git a/firmware/hackrf_usb/hackrf_usb.c b/firmware/hackrf_usb/hackrf_usb.c
index 3589f97d..88159db4 100644
--- a/firmware/hackrf_usb/hackrf_usb.c
+++ b/firmware/hackrf_usb/hackrf_usb.c
@@ -241,7 +241,7 @@ int main(void) {
 	
 	rf_path_init(&rf_path);
 
-	if( hackrf_ui() == NULL ) {
+	if( hackrf_ui()->operacake_gpio_compatible() ) {
 		operacake_allow_gpio = true;
 	} else {
 		operacake_allow_gpio = false;