diff --git a/simde/wasm/simd128.h b/simde/wasm/simd128.h
index e14bff235..8a9121b52 100644
--- a/simde/wasm/simd128.h
+++ b/simde/wasm/simd128.h
@@ -5787,6 +5787,8 @@ simde_wasm_u8x16_avgr (simde_v128_t a, simde_v128_t b) {
       r_.sse_m128i = _mm_avg_epu8(a_.sse_m128i, b_.sse_m128i);
     #elif defined(SIMDE_ARM_NEON_A32V7_NATIVE)
       r_.neon_u8 = vrhaddq_u8(a_.neon_u8, b_.neon_u8);
+    #elif defined(SIMDE_POWER_ALTIVEC_P6_NATIVE) || defined(SIMDE_ZARCH_ZVECTOR_13_NATIVE)
+      r_.altivec_u8 = vec_avg(a_.altivec_u8, b_.altivec_u8);
     #else
       SIMDE_VECTORIZE
       for (size_t i = 0 ; i < (sizeof(r_.u8) / sizeof(r_.u8[0])) ; i++) {
@@ -5816,6 +5818,8 @@ simde_wasm_u16x8_avgr (simde_v128_t a, simde_v128_t b) {
       r_.sse_m128i = _mm_avg_epu16(a_.sse_m128i, b_.sse_m128i);
     #elif defined(SIMDE_ARM_NEON_A32V7_NATIVE)
       r_.neon_u16 = vrhaddq_u16(a_.neon_u16, b_.neon_u16);
+    #elif defined(SIMDE_POWER_ALTIVEC_P6_NATIVE) || defined(SIMDE_ZARCH_ZVECTOR_13_NATIVE)
+      r_.altivec_u16 = vec_avg(a_.altivec_u16, b_.altivec_u16);
     #else
       SIMDE_VECTORIZE
       for (size_t i = 0 ; i < (sizeof(r_.u16) / sizeof(r_.u16[0])) ; i++) {