diff --git a/src/mesa/program/prog_parameter.h b/src/mesa/program/prog_parameter.h
index 37c0917ff38..26e2c3da72c 100644
--- a/src/mesa/program/prog_parameter.h
+++ b/src/mesa/program/prog_parameter.h
@@ -59,7 +59,6 @@ typedef enum
    PROGRAM_STATE_VAR,   /**< gl_program->Parameters[] */
    PROGRAM_CONSTANT,    /**< gl_program->Parameters[] */
    PROGRAM_UNIFORM,     /**< gl_program->Parameters[] */
-   PROGRAM_WRITE_ONLY,  /**< A dummy, write-only register */
    PROGRAM_ADDRESS,     /**< machine->AddressReg */
    PROGRAM_UNDEFINED,   /**< Invalid/TBD value */
    PROGRAM_FILE_MAX
diff --git a/src/mesa/program/prog_parameter_layout.c b/src/mesa/program/prog_parameter_layout.c
index be97a6a7deb..0f49f7e68ad 100644
--- a/src/mesa/program/prog_parameter_layout.c
+++ b/src/mesa/program/prog_parameter_layout.c
@@ -197,7 +197,7 @@ _mesa_layout_parameters(struct asm_parser_state *state)
 
          if (inst->SrcReg[i].Base.RelAddr ||
              inst->SrcReg[i].Base.File <= PROGRAM_OUTPUT ||
-             inst->SrcReg[i].Base.File >= PROGRAM_WRITE_ONLY ||
+             inst->SrcReg[i].Base.File >= PROGRAM_ADDRESS ||
              p->Type != PROGRAM_CONSTANT)
             continue;
 
@@ -234,7 +234,7 @@ _mesa_layout_parameters(struct asm_parser_state *state)
 
          if (inst->SrcReg[i].Base.RelAddr ||
              inst->SrcReg[i].Base.File <= PROGRAM_OUTPUT ||
-             inst->SrcReg[i].Base.File >= PROGRAM_WRITE_ONLY ||
+             inst->SrcReg[i].Base.File >= PROGRAM_ADDRESS ||
              p->Type != PROGRAM_STATE_VAR)
             continue;
 
@@ -271,7 +271,7 @@ _mesa_layout_parameters(struct asm_parser_state *state)
 
          if (inst->SrcReg[i].Base.RelAddr ||
              inst->SrcReg[i].Base.File <= PROGRAM_OUTPUT ||
-             inst->SrcReg[i].Base.File >= PROGRAM_WRITE_ONLY ||
+             inst->SrcReg[i].Base.File >= PROGRAM_ADDRESS ||
              p->Type != PROGRAM_STATE_VAR)
             continue;