diff --git a/include/mgba/internal/ds/gx/software.h b/include/mgba/internal/ds/gx/software.h
index b76864a04..141b2a279 100644
--- a/include/mgba/internal/ds/gx/software.h
+++ b/include/mgba/internal/ds/gx/software.h
@@ -27,18 +27,18 @@ struct DSGXSoftwareEdge {
 	int32_t y0; // 20.12
 	int32_t x0; // 20.12
 	int32_t w0; // 20.12
-	int8_t cr0;
-	int8_t cg0;
-	int8_t cb0;
+	uint8_t cr0;
+	uint8_t cg0;
+	uint8_t cb0;
 	int16_t s0;
 	int16_t t0;
 
 	int32_t y1; // 20.12
 	int32_t x1; // 20.12
 	int32_t w1; // 20.12
-	int8_t cr1;
-	int8_t cg1;
-	int8_t cb1;
+	uint8_t cr1;
+	uint8_t cg1;
+	uint8_t cb1;
 	int16_t s1;
 	int16_t t1;
 };
@@ -46,9 +46,9 @@ struct DSGXSoftwareEdge {
 struct DSGXSoftwareEndpoint {
 	int32_t x; // 20.12
 	int32_t w; // 20.12
-	int8_t cr;
-	int8_t cg;
-	int8_t cb;
+	uint8_t cr;
+	uint8_t cg;
+	uint8_t cb;
 	int16_t s;
 	int16_t t;
 };
diff --git a/src/ds/gx/software.c b/src/ds/gx/software.c
index 3b79fe7c2..ad10d0a03 100644
--- a/src/ds/gx/software.c
+++ b/src/ds/gx/software.c
@@ -21,13 +21,13 @@ static void DSGXSoftwareRendererSetRAM(struct DSGXRenderer* renderer, struct DSG
 static void DSGXSoftwareRendererDrawScanline(struct DSGXRenderer* renderer, int y);
 static void DSGXSoftwareRendererGetScanline(struct DSGXRenderer* renderer, int y, color_t** output);
 
-static void _expandColor(uint16_t c15, int8_t* r, int8_t* g, int8_t* b) {
+static void _expandColor(uint16_t c15, uint8_t* r, uint8_t* g, uint8_t* b) {
 	*r = ((c15 << 1) & 0x3E) | 1;
 	*g = ((c15 >> 4) & 0x3E) | 1;
 	*b = ((c15 >> 9) & 0x3E) | 1;
 }
 
-static color_t _finishColor(int8_t r, int8_t g, int8_t b) {
+static color_t _finishColor(uint8_t r, uint8_t g, uint8_t b) {
 #ifndef COLOR_16_BIT
 	color_t rgb = (r << 2) & 0xF8;
 	rgb |= (g << 10) & 0xF800;