diff --git a/GPU/Vulkan/ShaderManagerVulkan.cpp b/GPU/Vulkan/ShaderManagerVulkan.cpp
index 3fee8bd807..8bbd2628ef 100644
--- a/GPU/Vulkan/ShaderManagerVulkan.cpp
+++ b/GPU/Vulkan/ShaderManagerVulkan.cpp
@@ -316,10 +316,19 @@ void ShaderManagerVulkan::BaseUpdateUniforms(int dirtyUniforms) {
 		case GE_TEXMAP_TEXTURE_COORDS:
 			// Not sure what GE_TEXMAP_UNKNOWN is, but seen in Riviera.  Treating the same as GE_TEXMAP_TEXTURE_COORDS works.
 		case GE_TEXMAP_UNKNOWN:
-			uvscaleoff[0] = gstate_c.uv.uScale * factor * widthFactor;
-			uvscaleoff[1] = gstate_c.uv.vScale * factor * heightFactor;
-			uvscaleoff[2] = gstate_c.uv.uOff * widthFactor;
-			uvscaleoff[3] = gstate_c.uv.vOff * heightFactor;
+			if (g_Config.bPrescaleUV) {
+				// We are here but are prescaling UV in the decoder? Let's do the same as in the other case
+				// except consider *Scale and *Off to be 1 and 0.
+				uvscaleoff[0] = widthFactor;
+				uvscaleoff[1] = heightFactor;
+				uvscaleoff[2] = 0.0f;
+				uvscaleoff[3] = 0.0f;
+			} else {
+				uvscaleoff[0] = gstate_c.uv.uScale * factor * widthFactor;
+				uvscaleoff[1] = gstate_c.uv.vScale * factor * heightFactor;
+				uvscaleoff[2] = gstate_c.uv.uOff * widthFactor;
+				uvscaleoff[3] = gstate_c.uv.vOff * heightFactor;
+			}
 			break;
 
 			// These two work the same whether or not we prescale UV.