diff --git a/src/uucore/src/lib/features/checksum.rs b/src/uucore/src/lib/features/checksum.rs
index 9f4fe1d7776..79711476bc8 100644
--- a/src/uucore/src/lib/features/checksum.rs
+++ b/src/uucore/src/lib/features/checksum.rs
@@ -504,7 +504,6 @@ where
                     get_expected_checksum(filename_to_check, &caps, &chosen_regex)?;
 
                 // If the algo_name is provided, we use it, otherwise we try to detect it
-
                 let (algo_name, length) = if is_algo_based_format {
                     identify_algo_name_and_length(
                         &caps,
@@ -515,7 +514,16 @@ where
                     .unwrap_or((String::new(), None))
                 } else if let Some(a) = algo_name_input {
                     // When a specific algorithm name is input, use it and use the provided bits
-                    (a.to_lowercase(), length_input)
+                    // except when dealing with blake2b, where we will detect the length
+                    if algo_name_input == Some(ALGORITHM_OPTIONS_BLAKE2B) {
+                        let length = match expected_checksum.len() {
+                            128 | 96 | 64 | 48 | 32 => Some(expected_checksum.len() / 2),
+                            _ => length_input,
+                        };
+                        (ALGORITHM_OPTIONS_BLAKE2B.to_string(), length)
+                    } else {
+                        (a.to_lowercase(), length_input)
+                    }
                 } else {
                     // Default case if no algorithm is specified and non-algo based format is matched
                     (String::new(), None)
diff --git a/tests/by-util/test_hashsum.rs b/tests/by-util/test_hashsum.rs
index f9863a30fb3..5c9edeb839f 100644
--- a/tests/by-util/test_hashsum.rs
+++ b/tests/by-util/test_hashsum.rs
@@ -890,3 +890,26 @@ fn test_star_to_start() {
         .succeeds()
         .stdout_only("f: OK\n");
 }
+
+#[test]
+fn test_check_b2sum_strict_check() {
+    let scene = TestScenario::new(util_name!());
+    let at = &scene.fixtures;
+    at.touch("f");
+    at.write("ck", "cae66941d9efbd404e4d88758ea67670  f\n");
+
+    scene
+        .ccmd("b2sum")
+        .arg("-c")
+        .arg(at.subdir.join("ck"))
+        .succeeds()
+        .stdout_only("f: OK\n");
+
+    scene
+        .ccmd("b2sum")
+        .arg("--strict")
+        .arg("-c")
+        .arg(at.subdir.join("ck"))
+        .succeeds()
+        .stdout_only("f: OK\n");
+}