diff --git a/GPU/Common/FragmentShaderGenerator.cpp b/GPU/Common/FragmentShaderGenerator.cpp
index 2a6296ab70..6d3886035e 100644
--- a/GPU/Common/FragmentShaderGenerator.cpp
+++ b/GPU/Common/FragmentShaderGenerator.cpp
@@ -560,11 +560,10 @@ bool GenerateFragmentShader(const FShaderID &id, char *buffer, const ShaderLangu
 					}
 				} else {
 					if (texture3D) {
-						WRITE(p, "  float bias = u_mipBias * 1.0;\n");
 						if (doTextureProjection) {
-							WRITE(p, "  vec4 t = %sProj(tex, vec4(%s.xy, bias, %s.z));\n", compat.texture, texcoord, texcoord);
+							WRITE(p, "  vec4 t = %sProj(tex, vec4(%s.xy, u_mipBias, %s.z));\n", compat.texture, texcoord, texcoord);
 						} else {
-							WRITE(p, "  vec4 t = %s(tex, vec3(%s.xy, bias));\n", compat.texture, texcoord);
+							WRITE(p, "  vec4 t = %s(tex, vec3(%s.xy, u_mipBias));\n", compat.texture, texcoord);
 						}
 					} else {
 						if (doTextureProjection) {
diff --git a/GPU/Common/ShaderUniforms.cpp b/GPU/Common/ShaderUniforms.cpp
index 0fe8ce807a..77308b91ee 100644
--- a/GPU/Common/ShaderUniforms.cpp
+++ b/GPU/Common/ShaderUniforms.cpp
@@ -105,7 +105,8 @@ void BaseUpdateUniforms(UB_VS_FS_Base *ub, uint64_t dirtyUniforms, bool flipView
 		ub->texClampOffset[0] = gstate_c.curTextureXOffset * invW;
 		ub->texClampOffset[1] = gstate_c.curTextureYOffset * invH;
 
-		ub->mipBias = (float)gstate.getTexLevelOffset16() * (1.0 / 16.0f);
+		float mipBias = (float)gstate.getTexLevelOffset16() * (1.0 / 16.0f);
+		ub->mipBias = (mipBias + 0.5f) / (float)(gstate.getTextureMaxLevel() + 1);
 	}
 
 	if (dirtyUniforms & DIRTY_PROJMATRIX) {