diff --git a/src/simd_funcs.rs b/src/simd_funcs.rs
index 5ae00e6..d082418 100644
--- a/src/simd_funcs.rs
+++ b/src/simd_funcs.rs
@@ -349,6 +349,7 @@ cfg_if! {
 }
 
 #[cfg(test)]
+#[cfg(feature = "alloc")]
 mod tests {
     use super::*;
     use alloc::vec::Vec;
diff --git a/tests/test_data.rs b/tests/test_data.rs
index 6a9d370..e026726 100644
--- a/tests/test_data.rs
+++ b/tests/test_data.rs
@@ -1,3 +1,4 @@
+#[cfg(feature = "alloc")]
 mod test_data {
     mod big5;
     mod euc_jp;