diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c
index 7d7960b..c82e843 100644
--- a/src/mesa/main/texgetimage.c
+++ b/src/mesa/main/texgetimage.c
@@ -241,8 +241,32 @@ get_tex_rgba(struct gl_context *ctx, GLuint dimensions,
          return;
       }
 
-      _mesa_decompress_image(texFormat, texImage->Width, texImage->Height,
-                             texImage->Data, texImage->RowStride, tempImage);
+      /* Decompress the texture image - results in 'tempImage' */
+      {
+         GLubyte *srcMap;
+         GLint srcRowStride;
+         GLuint bytes, bw, bh;
+
+         bytes = _mesa_get_format_bytes(texImage->TexFormat);
+         _mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);
+
+         ctx->Driver.MapTextureImage(ctx, texImage, 0,
+                                     0, 0, width, height,
+                                     GL_MAP_READ_BIT,
+                                     &srcMap, &srcRowStride);
+
+         /* XXX This line is a bit of a hack to work around the
+          * mismatch of compressed row strides as returned by
+          * MapTextureImage() vs. what the texture decompression code
+          * uses.  This will be fixed in the future.
+          */
+         srcRowStride = width;
+
+         _mesa_decompress_image(texFormat, width, height,
+                                srcMap, srcRowStride, tempImage);
+
+         ctx->Driver.UnmapTextureImage(ctx, texImage, 0);
+      }
 
       if (baseFormat == GL_LUMINANCE ||
           baseFormat == GL_LUMINANCE_ALPHA) {