diff --git a/build.rs b/build.rs
index 4fd3bae..c5677f6 100644
--- a/build.rs
+++ b/build.rs
@@ -44,6 +44,14 @@ fn is_x86_32() -> bool {
     arch == "i386" || arch == "i586" || arch == "i686"
 }
 
+fn is_arm() -> bool {
+    is_armv7() || is_aarch64() || target_components()[0] == "arm"
+}
+
+fn is_aarch64() -> bool {
+    target_components()[0] == "aarch64"
+}
+
 fn is_armv7() -> bool {
     target_components()[0] == "armv7"
 }
@@ -237,7 +245,8 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         }
     }
 
-    if is_neon() {
+    if (is_arm() && is_neon()) || (is_aarch64() && !is_pure()) {
+        println!("cargo:rustc-cfg=blake3_neon");
         build_neon_c_intrinsics();
     }
 
diff --git a/src/lib.rs b/src/lib.rs
index 4123a0b..31e5cd6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -94,7 +94,7 @@ mod avx2;
 #[cfg(blake3_avx512_ffi)]
 #[path = "ffi_avx512.rs"]
 mod avx512;
-#[cfg(feature = "neon")]
+#[cfg(blake3_neon)]
 #[path = "ffi_neon.rs"]
 mod neon;
 mod portable;
diff --git a/src/platform.rs b/src/platform.rs
index 1a732c5..00058b1 100644
--- a/src/platform.rs
+++ b/src/platform.rs
@@ -10,7 +10,7 @@ cfg_if::cfg_if! {
                 pub const MAX_SIMD_DEGREE: usize = 8;
             }
         }
-    } else if #[cfg(feature = "neon")] {
+    } else if #[cfg(blake3_neon)] {
         pub const MAX_SIMD_DEGREE: usize = 4;
     } else {
         pub const MAX_SIMD_DEGREE: usize = 1;
@@ -30,7 +30,7 @@ cfg_if::cfg_if! {
                 pub const MAX_SIMD_DEGREE_OR_2: usize = 8;
             }
         }
-    } else if #[cfg(feature = "neon")] {
+    } else if #[cfg(blake3_neon)] {
         pub const MAX_SIMD_DEGREE_OR_2: usize = 4;
     } else {
         pub const MAX_SIMD_DEGREE_OR_2: usize = 2;
@@ -49,7 +49,7 @@ pub enum Platform {
     #[cfg(blake3_avx512_ffi)]
     #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
     AVX512,
-    #[cfg(feature = "neon")]
+    #[cfg(blake3_neon)]
     NEON,
 }
 
@@ -76,7 +76,7 @@ impl Platform {
         }
         // We don't use dynamic feature detection for NEON. If the "neon"
         // feature is on, NEON is assumed to be supported.
-        #[cfg(feature = "neon")]
+        #[cfg(blake3_neon)]
         {
             return Platform::NEON;
         }
@@ -95,7 +95,7 @@ impl Platform {
             #[cfg(blake3_avx512_ffi)]
             #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
             Platform::AVX512 => 16,
-            #[cfg(feature = "neon")]
+            #[cfg(blake3_neon)]
             Platform::NEON => 4,
         };
         debug_assert!(degree <= MAX_SIMD_DEGREE);
@@ -129,7 +129,7 @@ impl Platform {
                 crate::avx512::compress_in_place(cv, block, block_len, counter, flags)
             },
             // No NEON compress_in_place() implementation yet.
-            #[cfg(feature = "neon")]
+            #[cfg(blake3_neon)]
             Platform::NEON => portable::compress_in_place(cv, block, block_len, counter, flags),
         }
     }
@@ -161,7 +161,7 @@ impl Platform {
                 crate::avx512::compress_xof(cv, block, block_len, counter, flags)
             },
             // No NEON compress_xof() implementation yet.
-            #[cfg(feature = "neon")]
+            #[cfg(blake3_neon)]
             Platform::NEON => portable::compress_xof(cv, block, block_len, counter, flags),
         }
     }
@@ -256,7 +256,7 @@ impl Platform {
                 )
             },
             // Assumed to be safe if the "neon" feature is on.
-            #[cfg(feature = "neon")]
+            #[cfg(blake3_neon)]
             Platform::NEON => unsafe {
                 crate::neon::hash_many(
                     inputs,
@@ -315,7 +315,7 @@ impl Platform {
         }
     }
 
-    #[cfg(feature = "neon")]
+    #[cfg(blake3_neon)]
     pub fn neon() -> Option<Self> {
         // Assumed to be safe if the "neon" feature is on.
         Some(Self::NEON)