diff --git a/src/mesa/program/prog_instruction.h b/src/mesa/program/prog_instruction.h
index a383828e344..669d7102980 100644
--- a/src/mesa/program/prog_instruction.h
+++ b/src/mesa/program/prog_instruction.h
@@ -247,7 +247,7 @@ typedef enum prog_opcode {
  * Number of bits for the src/dst register Index field.
  * This limits the size of temp/uniform register files.
  */
-#define INST_INDEX_BITS 11
+#define INST_INDEX_BITS 12
 
 
 /**