diff --git a/src/rlgl.h b/src/rlgl.h
index 123791a02..363b45bd3 100644
--- a/src/rlgl.h
+++ b/src/rlgl.h
@@ -243,6 +243,7 @@
 #define RL_TEXTURE_FILTER_LINEAR_MIP_NEAREST    0x2701      // GL_LINEAR_MIPMAP_NEAREST
 #define RL_TEXTURE_FILTER_MIP_LINEAR            0x2703      // GL_LINEAR_MIPMAP_LINEAR
 #define RL_TEXTURE_FILTER_ANISOTROPIC           0x3000      // Anisotropic filter (custom identifier)
+#define RL_TEXTURE_MIPMAP_BIAS_RATIO            0x4000      // Texture mipmap bias (percentage ratio)
 
 #define RL_TEXTURE_WRAP_REPEAT                  0x2901      // GL_REPEAT
 #define RL_TEXTURE_WRAP_CLAMP                   0x812F      // GL_CLAMP_TO_EDGE
@@ -1551,6 +1552,9 @@ void rlTextureParameters(unsigned int id, int param, int value)
             else TRACELOG(RL_LOG_WARNING, "GL: Anisotropic filtering not supported");
 #endif
         } break;
+#if defined(GRAPHICS_API_OPENGL_33)
+        case RL_TEXTURE_MIPMAP_BIAS_RATIO: glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_LOD_BIAS, value/100.0f);
+#endif
         default: break;
     }