diff --git a/simon-simd.cpp b/simon-simd.cpp
index c621e6e6..42b99703 100644
--- a/simon-simd.cpp
+++ b/simon-simd.cpp
@@ -492,7 +492,6 @@ inline __m128i RotateRight64(const __m128i& val)
 template <>
 inline __m128i RotateLeft64<8>(const __m128i& val)
 {
-    CRYPTOPP_ASSERT(R < 64);
     const __m128i mask = _mm_set_epi8(14,13,12,11, 10,9,8,15, 6,5,4,3, 2,1,0,7);
     return _mm_shuffle_epi8(val, mask);
 }
@@ -501,7 +500,6 @@ inline __m128i RotateLeft64<8>(const __m128i& val)
 template <>
 inline __m128i RotateRight64<8>(const __m128i& val)
 {
-    CRYPTOPP_ASSERT(R < 64);
     const __m128i mask = _mm_set_epi8(8,15,14,13, 12,11,10,9, 0,7,6,5, 4,3,2,1);
     return _mm_shuffle_epi8(val, mask);
 }
diff --git a/speck-simd.cpp b/speck-simd.cpp
index f553d7e8..f883515c 100644
--- a/speck-simd.cpp
+++ b/speck-simd.cpp
@@ -439,7 +439,6 @@ inline __m128i RotateRight64(const __m128i& val)
 template <>
 inline __m128i RotateLeft64<8>(const __m128i& val)
 {
-    CRYPTOPP_ASSERT(R < 64);
     const __m128i mask = _mm_set_epi8(14,13,12,11, 10,9,8,15, 6,5,4,3, 2,1,0,7);
     return _mm_shuffle_epi8(val, mask);
 }
@@ -448,7 +447,6 @@ inline __m128i RotateLeft64<8>(const __m128i& val)
 template <>
 inline __m128i RotateRight64<8>(const __m128i& val)
 {
-    CRYPTOPP_ASSERT(R < 64);
     const __m128i mask = _mm_set_epi8(8,15,14,13, 12,11,10,9, 0,7,6,5, 4,3,2,1);
     return _mm_shuffle_epi8(val, mask);
 }