diff --git a/lib/compress/zstdmt_compress.c b/lib/compress/zstdmt_compress.c
index c3d912073..e8b42224c 100644
--- a/lib/compress/zstdmt_compress.c
+++ b/lib/compress/zstdmt_compress.c
@@ -106,6 +106,7 @@ ZSTDMT_RustBufferPool* ZSTDMT_rust_buffer_pool_create(unsigned maxNbBuffers,
                                                        ZSTD_customMem cMem);
 void ZSTDMT_rust_buffer_pool_free(ZSTDMT_RustBufferPool* pool);
 size_t ZSTDMT_rust_buffer_pool_sizeof(const ZSTDMT_RustBufferPool* pool);
+size_t ZSTDMT_rust_sizeofBufferPool(size_t wrapperSize, size_t rustPoolSize);
 void ZSTDMT_rust_buffer_pool_set_size(ZSTDMT_RustBufferPool* pool, size_t bSize);
 ZSTDMT_RustBufferPool* ZSTDMT_rust_buffer_pool_expand(ZSTDMT_RustBufferPool* pool,
                                                        unsigned maxNbBuffers);
@@ -186,7 +187,8 @@ static ZSTDMT_bufferPool* ZSTDMT_createBufferPool(unsigned maxNbBuffers, ZSTD_cu
 static size_t ZSTDMT_sizeof_bufferPool(ZSTDMT_bufferPool* bufPool)
 {
     if (bufPool == NULL) return 0;
-    return sizeof(*bufPool) + ZSTDMT_rust_buffer_pool_sizeof(bufPool->rustPool);
+    return ZSTDMT_rust_sizeofBufferPool(
+        sizeof(*bufPool), ZSTDMT_rust_buffer_pool_sizeof(bufPool->rustPool));
 }
 
 /* ZSTDMT_setBufferSize() :
diff --git a/rust/src/zstdmt_compress.rs b/rust/src/zstdmt_compress.rs
index 056a35e93..d52a8d2df 100644
--- a/rust/src/zstdmt_compress.rs
+++ b/rust/src/zstdmt_compress.rs
@@ -686,6 +686,16 @@ pub unsafe extern "C" fn ZSTDMT_rust_buffer_pool_sizeof(pool: *const RustBufferP
         .saturating_add(total_buffer_size)
 }
 
+#[inline]
+fn sizeof_buffer_pool(wrapper_size: usize, rust_pool_size: usize) -> usize {
+    wrapper_size.wrapping_add(rust_pool_size)
+}
+
+#[no_mangle]
+pub extern "C" fn ZSTDMT_rust_sizeofBufferPool(wrapperSize: usize, rustPoolSize: usize) -> usize {
+    sizeof_buffer_pool(wrapperSize, rustPoolSize)
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn ZSTDMT_rust_buffer_pool_set_size(
     pool: *mut RustBufferPool,
@@ -1608,4 +1618,22 @@ mod tests {
         assert_eq!(sizeof_cctx_pool(usize::MAX, 1), 0);
         assert_eq!(sizeof_cctx_pool(usize::MAX - 7, 11), 3);
     }
+
+    #[test]
+    fn buffer_pool_size_addition_handles_zero_components() {
+        assert_eq!(sizeof_buffer_pool(0, 0), 0);
+        assert_eq!(sizeof_buffer_pool(37, 0), 37);
+        assert_eq!(sizeof_buffer_pool(0, 53), 53);
+    }
+
+    #[test]
+    fn buffer_pool_size_addition_preserves_ordinary_sum() {
+        assert_eq!(sizeof_buffer_pool(128, 4096), 4224);
+    }
+
+    #[test]
+    fn buffer_pool_size_addition_wraps_like_c_size_t() {
+        assert_eq!(sizeof_buffer_pool(usize::MAX, 1), 0);
+        assert_eq!(sizeof_buffer_pool(usize::MAX - 7, 11), 3);
+    }
 }