diff --git a/include/mgba-util/circle-buffer.h b/include/mgba-util/circle-buffer.h
index 995f2f32b..137b6a7f9 100644
--- a/include/mgba-util/circle-buffer.h
+++ b/include/mgba-util/circle-buffer.h
@@ -27,6 +27,7 @@ int CircleBufferWrite8(struct CircleBuffer* buffer, int8_t value);
 int CircleBufferWrite16(struct CircleBuffer* buffer, int16_t value);
 int CircleBufferWrite32(struct CircleBuffer* buffer, int32_t value);
 size_t CircleBufferWrite(struct CircleBuffer* buffer, const void* input, size_t length);
+size_t CircleBufferWriteTruncate(struct CircleBuffer* buffer, const void* input, size_t length);
 int CircleBufferRead8(struct CircleBuffer* buffer, int8_t* value);
 int CircleBufferRead16(struct CircleBuffer* buffer, int16_t* value);
 int CircleBufferRead32(struct CircleBuffer* buffer, int32_t* value);
diff --git a/src/util/circle-buffer.c b/src/util/circle-buffer.c
index d58ea0c44..12ead5033 100644
--- a/src/util/circle-buffer.c
+++ b/src/util/circle-buffer.c
@@ -153,6 +153,13 @@ size_t CircleBufferWrite(struct CircleBuffer* buffer, const void* input, size_t
 	return length;
 }
 
+size_t CircleBufferWriteTruncate(struct CircleBuffer* buffer, const void* input, size_t length) {
+	if (buffer->size + length > buffer->capacity) {
+		length = buffer->capacity - buffer->size;
+	}
+	return CircleBufferWrite(buffer, input, length);
+}
+
 int CircleBufferRead8(struct CircleBuffer* buffer, int8_t* value) {
 	int8_t* data = buffer->readPtr;
 	if (buffer->size < sizeof(int8_t)) {
diff --git a/src/util/test/circle-buffer.c b/src/util/test/circle-buffer.c
index 1bfb0c111..b60f73a56 100644
--- a/src/util/test/circle-buffer.c
+++ b/src/util/test/circle-buffer.c
@@ -196,6 +196,32 @@ M_TEST_DEFINE(writeLenCapacity) {
 	CircleBufferDeinit(&buffer);
 }
 
+M_TEST_DEFINE(writeTruncate) {
+	struct CircleBuffer buffer;
+	const char* data = " Lorem ipsum dolor sit amet, consectetur adipiscing elit placerat.";
+	char databuf[64];
+
+	CircleBufferInit(&buffer, 64);
+
+	assert_int_equal(CircleBufferWriteTruncate(&buffer, data, 64), 64);
+	assert_int_equal(CircleBufferSize(&buffer), 64);
+	assert_int_equal(CircleBufferRead(&buffer, databuf, 64), 64);
+	assert_int_equal(CircleBufferSize(&buffer), 0);
+	assert_memory_equal(data, databuf, 64);
+
+	assert_int_equal(CircleBufferWriteTruncate(&buffer, data, 48), 48);
+	assert_int_equal(CircleBufferSize(&buffer), 48);
+	assert_int_equal(CircleBufferWrite(&buffer, data, 48), 0);
+	assert_int_equal(CircleBufferSize(&buffer), 48);
+	assert_int_equal(CircleBufferWriteTruncate(&buffer, data, 48), 16);
+	assert_int_equal(CircleBufferSize(&buffer), 64);
+	assert_int_equal(CircleBufferRead(&buffer, databuf, 64), 64);
+	assert_memory_equal(data, databuf, 48);
+	assert_memory_equal(data, &databuf[48], 16);
+
+	CircleBufferDeinit(&buffer);
+}
+
 M_TEST_DEFINE(dumpBasic) {
 	struct CircleBuffer buffer;
 	const char* data = " Lorem ipsum dolor sit amet, consectetur adipiscing elit placerat.";
@@ -284,6 +310,7 @@ M_TEST_SUITE_DEFINE(CircleBuffer,
 	cmocka_unit_test(capacity),
 	cmocka_unit_test(overCapacity16),
 	cmocka_unit_test(writeLenCapacity),
+	cmocka_unit_test(writeTruncate),
 	cmocka_unit_test(dumpBasic),
 	cmocka_unit_test(dumpOffset),
 )