diff --git a/library/sha256.c b/library/sha256.c
index 223badf..20d5188 100644
--- a/library/sha256.c
+++ b/library/sha256.c
@@ -110,7 +110,7 @@
 #      include <signal.h>
 #    endif
 #  endif
-#elif defined(_M_ARM64)
+#elif defined(_M_ARM64) || defined(_M_ARM64EC)
 #  if defined(MBEDTLS_SHA256_USE_A64_CRYPTO_IF_PRESENT) || \
     defined(MBEDTLS_SHA256_USE_A64_CRYPTO_ONLY)
 #    include <arm64_neon.h>
@@ -135,7 +135,7 @@
 {
     return 1;
 }
-#elif defined(_M_ARM64)
+#elif defined(_M_ARM64) || defined(_M_ARM64EC)
 #define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
 #include <processthreadsapi.h>
diff --git a/library/sha512.c b/library/sha512.c
index e739af2..23e8745 100644
--- a/library/sha512.c
+++ b/library/sha512.c
@@ -154,7 +154,7 @@
                            NULL, 0);
     return ret == 0 && value != 0;
 }
-#elif defined(_M_ARM64)
+#elif defined(_M_ARM64) || defined(_M_ARM64EC)
 /*
  * As of March 2022, there don't appear to be any PF_ARM_V8_* flags
  * available to pass to IsProcessorFeaturePresent() to check for