diff --git a/include/runtime_services/spm_common.h b/include/runtime_services/spm_common.h
index 6fe445a..7f47dc7 100644
--- a/include/runtime_services/spm_common.h
+++ b/include/runtime_services/spm_common.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021-2022, Arm Limited. All rights reserved.
+ * Copyright (c) 2021-2023, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -97,27 +97,15 @@
 void dump_ffa_value(struct ffa_value ret);
 
 /*
- * Max. vector length:
- * SIMD: 128 bits = 16 bytes
- */
-#define SIMD_VECTOR_LEN_BYTES		16
-
-#define SIMD_NUM_VECTORS		32
-
-typedef uint8_t simd_vector_t[SIMD_VECTOR_LEN_BYTES];
-
-/*
  * Fills SIMD/SVE registers with the content of the container v.
  * Number of vectors is assumed to be SIMD/SVE_NUM_VECTORS.
  */
-void fill_simd_vector_regs(const simd_vector_t v[SIMD_NUM_VECTORS]);
 void fill_sve_vector_regs(const sve_vector_t v[SVE_NUM_VECTORS]);
 
 /*
  * Reads contents of SIMD/SVE registers into the provided container v.
  * Number of vectors is assumed to be SIMD/SVE_NUM_VECTORS.
  */
-void read_simd_vector_regs(simd_vector_t v[SIMD_NUM_VECTORS]);
 void read_sve_vector_regs(sve_vector_t v[SVE_NUM_VECTORS]);
 
 bool check_spmc_execution_level(void);