diff --git a/gf2n_simd.cpp b/gf2n_simd.cpp
index 6a1bd896..d0102975 100644
--- a/gf2n_simd.cpp
+++ b/gf2n_simd.cpp
@@ -318,8 +318,8 @@ using CryptoPP::VecXor;
 using CryptoPP::VecAnd;
 
 using CryptoPP::VecPermute;
-using CryptoPP::VecMergeHi;
-using CryptoPP::VecMergeLo;
+using CryptoPP::VecMergeHigh;
+using CryptoPP::VecMergeLow;
 using CryptoPP::VecShiftLeft;
 using CryptoPP::VecShiftRight;
 using CryptoPP::VecRotateLeftOctet;
@@ -336,16 +336,16 @@ F2N_Multiply_128x128_POWER8(uint64x2_p& c1, uint64x2_p& c0, const uint64x2_p& a,
 
     c0 = VecPolyMultiply00LE(a, b);
     c1 = VecPolyMultiply11LE(a, b);
-    t1 = VecMergeLo(a, a);
+    t1 = VecMergeLow(a, a);
     t1 = VecXor(a, t1);
-    t2 = VecMergeLo(b, b);
+    t2 = VecMergeLow(b, b);
     t2 = VecXor(b, t2);
     t1 = VecPolyMultiply00LE(t1, t2);
     t1 = VecXor(c0, t1);
     t1 = VecXor(c1, t1);
     t2 = t1;
-    t1 = VecMergeHi(z0, t1);
-    t2 = VecMergeLo(t2, z0);
+    t1 = VecMergeHigh(z0, t1);
+    t2 = VecMergeLow(t2, z0);
     c0 = VecXor(c0, t1);
     c1 = VecXor(c1, t2);
 }
@@ -394,7 +394,7 @@ inline uint64x2_p ShiftLeft128_POWER8(uint64x2_p x)
 
     x = VecShiftLeft<N>(x);
     u = VecShiftRight<64-N>(u);
-    v = VecMergeHi(z, u);
+    v = VecMergeHigh(z, u);
     x = VecOr(x, v);
     return x;
 }
@@ -411,41 +411,41 @@ GF2NT_233_Reduce_POWER8(uint64x2_p& c3, uint64x2_p& c2, uint64x2_p& c1, uint64x2
     const uint64x2_p z0={0};
 
     b1 = c1; a1 = c1;
-    a0 = VecMergeHi(c1, z0);
+    a0 = VecMergeHigh(c1, z0);
     a1 = VecShiftLeft<23>(a1);
     a1 = VecShiftRight<23>(a1);
     c1 = VecOr(a1, a0);
     b2 = VecShiftRight<64-23>(c2);
     c3 = ShiftLeft128_POWER8<23>(c3);
-    a0 = VecMergeLo(b2, z0);
+    a0 = VecMergeLow(b2, z0);
     c3 = VecOr(c3, a0);
     b1 = VecShiftRight<64-23>(b1);
     c2 = ShiftLeft128_POWER8<23>(c2);
-    a0 = VecMergeLo(b1, z0);
+    a0 = VecMergeLow(b1, z0);
     c2 = VecOr(c2, a0);
     b3 = c3;
     b2 = VecShiftRight<64-10>(c2);
     b3 = ShiftLeft128_POWER8<10>(b3);
-    a0 = VecMergeLo(b2, z0);
+    a0 = VecMergeLow(b2, z0);
     b3 = VecOr(b3, a0);
-    a0 = VecMergeLo(c3, z0);
+    a0 = VecMergeLow(c3, z0);
     b3 = VecXor(b3, a0);
     b1 = VecShiftRight<64-23>(b3);
     b3 = ShiftLeft128_POWER8<23>(b3);
-    b3 = VecMergeLo(b3, z0);
+    b3 = VecMergeLow(b3, z0);
     b3 = VecOr(b3, b1);
     c2 = VecXor(c2, b3);
     b3 = c3;
     b2 = VecShiftRight<64-10>(c2);
     b3 = ShiftLeft128_POWER8<10>(b3);
-    b2 = VecMergeLo(b2, z0);
+    b2 = VecMergeLow(b2, z0);
     b3 = VecOr(b3, b2);
     b2 = c2;
     b2 = ShiftLeft128_POWER8<10>(b2);
-    a0 = VecMergeHi(z0, b2);
+    a0 = VecMergeHigh(z0, b2);
     c2 = VecXor(c2, a0);
-    a0 = VecMergeHi(z0, b3);
-    a1 = VecMergeLo(b2, z0);
+    a0 = VecMergeHigh(z0, b3);
+    a1 = VecMergeLow(b2, z0);
     a0 = VecOr(a0, a1);
     c3 = VecXor(c3, a0);
     c0 = VecXor(c0, c2);
diff --git a/ppc_simd.h b/ppc_simd.h
index 9f818039..d074e33f 100644
--- a/ppc_simd.h
+++ b/ppc_simd.h
@@ -1214,7 +1214,7 @@ inline uint32x4_p VecShiftLeft(const uint32x4_p vec)
 ///   vec_mergeh
 /// \since Crypto++ 8.1
 template <class T>
-inline T VecMergeHi(const T vec1, const T vec2)
+inline T VecMergeHigh(const T vec1, const T vec2)
 {
     return vec_mergeh(vec1, vec2);
 }
@@ -1228,7 +1228,7 @@ inline T VecMergeHi(const T vec1, const T vec2)
 ///   vec_mergel
 /// \since Crypto++ 8.1
 template <class T>
-inline T VecMergeLo(const T vec1, const T vec2)
+inline T VecMergeLow(const T vec1, const T vec2)
 {
     return vec_mergel(vec1, vec2);
 }
@@ -1364,7 +1364,7 @@ inline T VecGetLow(const T val)
 {
 #if (CRYPTOPP_BIG_ENDIAN) && (_ARCH_PWR8)
     const T zero = {0};
-    return (T)VecMergeLo((uint64x2_p)zero, (uint64x2_p)val);
+    return (T)VecMergeLow((uint64x2_p)zero, (uint64x2_p)val);
 #else
     return VecShiftRightOctet<8>(VecShiftLeftOctet<8>(val));
 #endif
@@ -1386,7 +1386,7 @@ inline T VecGetHigh(const T val)
 {
 #if (CRYPTOPP_BIG_ENDIAN) && (_ARCH_PWR8)
     const T zero = {0};
-    return (T)VecMergeHi((uint64x2_p)zero, (uint64x2_p)val);
+    return (T)VecMergeHigh((uint64x2_p)zero, (uint64x2_p)val);
 #else
     return VecShiftRightOctet<8>(val);
 #endif