diff --git a/src/gb/renderers/software.c b/src/gb/renderers/software.c
index f90d8d674..ffb1aefba 100644
--- a/src/gb/renderers/software.c
+++ b/src/gb/renderers/software.c
@@ -570,7 +570,7 @@ static void GBVideoSoftwareRendererDrawRange(struct GBVideoRenderer* renderer, i
 		maps += GB_SIZE_MAP;
 	}
 	if (softwareRenderer->d.disableBG) {
-		memset(&softwareRenderer->row[startX], 0, endX - startX);
+		memset(&softwareRenderer->row[startX], 0, (endX - startX) * sizeof(softwareRenderer->row[0]));
 	}
 	if (GBRegisterLCDCIsBgEnable(softwareRenderer->lcdc) || softwareRenderer->model >= GB_MODEL_CGB) {
 		int wy = softwareRenderer->wy + softwareRenderer->currentWy;
@@ -592,7 +592,7 @@ static void GBVideoSoftwareRendererDrawRange(struct GBVideoRenderer* renderer, i
 			GBVideoSoftwareRendererDrawBackground(softwareRenderer, maps, startX, endX, softwareRenderer->scx - softwareRenderer->offsetScx, softwareRenderer->scy + y - softwareRenderer->offsetScy, renderer->highlightBG);
 		}
 	} else if (!softwareRenderer->d.disableBG) {
-		memset(&softwareRenderer->row[startX], 0, endX - startX);
+		memset(&softwareRenderer->row[startX], 0, (endX - startX) * sizeof(softwareRenderer->row[0]));
 	}
 
 	if (GBRegisterLCDCIsObjEnable(softwareRenderer->lcdc) && !softwareRenderer->d.disableOBJ) {