diff --git a/rust/src/zstdmt_compress.rs b/rust/src/zstdmt_compress.rs
index 5da5eccf8..a81454e2c 100644
--- a/rust/src/zstdmt_compress.rs
+++ b/rust/src/zstdmt_compress.rs
@@ -543,6 +543,7 @@ struct ZSTDMT_compressionJobSequenceProjection {
 }
 
 #[inline]
+#[cfg(not(test))]
 unsafe fn compression_job_sequence_projection(
     state: *const ZSTDMT_compressionJobSequenceState,
 ) -> Option<ZSTDMT_compressionJobSequenceProjection> {