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-rw-r--r--src/mesa/swrast/s_fragprog.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mesa/swrast/s_fragprog.c b/src/mesa/swrast/s_fragprog.c
index b71fb9eae9..144f78b024 100644
--- a/src/mesa/swrast/s_fragprog.c
+++ b/src/mesa/swrast/s_fragprog.c
@@ -108,7 +108,7 @@ fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4],
lambda = _swrast_compute_lambda(texdx[0], texdy[0], /* ds/dx, ds/dy */
texdx[1], texdy[1], /* dt/dx, dt/dy */
- texdx[3], texdy[2], /* dq/dx, dq/dy */
+ texdx[3], texdy[3], /* dq/dx, dq/dy */
texW, texH,
texcoord[0], texcoord[1], texcoord[3],
1.0F / texcoord[3]) + lodBias;