diff --git a/adv-simd.h b/adv-simd.h
index 1cbd67ae..24e01e20 100644
--- a/adv-simd.h
+++ b/adv-simd.h
@@ -43,10 +43,9 @@
 # include <arm_neon.h>
 #endif
 
-#if (CRYPTOPP_SSSE3_AVAILABLE)
-# include <emmintrin.h>
-# include <pmmintrin.h>
-# include <tmmintrin.h>
+#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE)
+# include <immintrin.h>
+# include <xmmintrin.h>
 #endif
 
 #if defined(CRYPTOPP_ALTIVEC_AVAILABLE)
diff --git a/lea-simd.cpp b/lea-simd.cpp
index ac43bdf7..a43b719a 100644
--- a/lea-simd.cpp
+++ b/lea-simd.cpp
@@ -255,7 +255,7 @@ inline uint32x4_t RepackNEON(const uint32x4_t& v)
     return UnpackNEON<IDX>(v);
 }
 
-void LEA_Encryption(uint32x4_t temp[4], const word32 *subkeys, unsigned int rounds)
+inline void LEA_Encryption(uint32x4_t temp[4], const word32 *subkeys, unsigned int rounds)
 {
     temp[3] = RotateRight<3>(Add(Xor(temp[2], LoadKey<4>(subkeys)), Xor(temp[3], LoadKey<5>(subkeys))));
     temp[2] = RotateRight<5>(Add(Xor(temp[1], LoadKey<2>(subkeys)), Xor(temp[2], LoadKey<3>(subkeys))));
@@ -368,7 +368,7 @@ void LEA_Encryption(uint32x4_t temp[4], const word32 *subkeys, unsigned int roun
     }
 }
 
-void LEA_Decryption(uint32x4_t temp[4], const word32 *subkeys, unsigned int rounds)
+inline void LEA_Decryption(uint32x4_t temp[4], const word32 *subkeys, unsigned int rounds)
 {
     if(rounds > 28)
     {