diff --git a/Cargo.lock b/Cargo.lock
index cdba3b784..31787e626 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -333,6 +333,16 @@ dependencies = [
  "walkdir",
 ]
 
+[[package]]
+name = "coz"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cef55b3fe2f5477d59e12bc792e8b3c95a25bd099eadcfae006ecea136de76e2"
+dependencies = [
+ "libc",
+ "once_cell",
+]
+
 [[package]]
 name = "cpp"
 version = "0.5.6"
@@ -608,7 +618,7 @@ checksum = "1d34cfa13a63ae058bfa601fe9e313bbdb3746427c1459185464ce0fcf62e1e8"
 dependencies = [
  "cfg-if 1.0.0",
  "libc",
- "redox_syscall 0.2.6",
+ "redox_syscall 0.2.7",
  "winapi 0.3.9",
 ]
 
@@ -1249,9 +1259,9 @@ checksum = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"
 
 [[package]]
 name = "redox_syscall"
-version = "0.2.6"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8270314b5ccceb518e7e578952f0b72b88222d02e8f77f5ecf7abbb673539041"
+checksum = "85dd92e586f7355c633911e11f77f3d12f04b1b1bd76a198bd34ae3af8341ef2"
 dependencies = [
  "bitflags",
 ]
@@ -1262,7 +1272,7 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8440d8acb4fd3d277125b4bd01a6f38aee8d814b3b5fc09b3f2b825d37d3fe8f"
 dependencies = [
- "redox_syscall 0.2.6",
+ "redox_syscall 0.2.7",
 ]
 
 [[package]]
@@ -1533,7 +1543,7 @@ checksum = "077185e2eac69c3f8379a4298e1e07cd36beb962290d4a51199acf0fdc10607e"
 dependencies = [
  "libc",
  "numtoa",
- "redox_syscall 0.2.6",
+ "redox_syscall 0.2.7",
  "redox_termios",
 ]
 
@@ -1898,6 +1908,7 @@ dependencies = [
 name = "uu_factor"
 version = "0.0.6"
 dependencies = [
+ "coz",
  "criterion",
  "num-traits",
  "paste",
diff --git a/src/uu/factor/Cargo.toml b/src/uu/factor/Cargo.toml
index 489c713be..c4e7e8469 100644
--- a/src/uu/factor/Cargo.toml
+++ b/src/uu/factor/Cargo.toml
@@ -14,8 +14,8 @@ edition = "2018"
 [build-dependencies]
 num-traits = "0.2.13" # used in src/numerics.rs, which is included by build.rs
 
-
 [dependencies]
+coz = { version = "0.1.3", optional = true }
 num-traits = "0.2.13" # Needs at least version 0.2.13 for "OverflowingAdd"
 rand = { version="0.7", features=["small_rng"] }
 smallvec = { version="0.6.14, < 1.0" }
diff --git a/src/uu/factor/src/factor.rs b/src/uu/factor/src/factor.rs
index 7d2e16a11..42586d1da 100644
--- a/src/uu/factor/src/factor.rs
+++ b/src/uu/factor/src/factor.rs
@@ -125,6 +125,8 @@ fn _factor<A: Arithmetic + miller_rabin::Basis>(num: u64, f: Factors) -> Factors
     let n = A::new(num);
     let divisor = match miller_rabin::test::<A>(n) {
         Prime => {
+            #[cfg(feature="coz")]
+            coz::progress!("factor found");
             let mut r = f;
             r.push(num);
             return r;
@@ -139,6 +141,8 @@ fn _factor<A: Arithmetic + miller_rabin::Basis>(num: u64, f: Factors) -> Factors
 }
 
 pub fn factor(mut n: u64) -> Factors {
+    #[cfg(feature="coz")]
+    coz::begin!("factorization");
     let mut factors = Factors::one();
 
     if n < 2 {
@@ -152,16 +156,23 @@ pub fn factor(mut n: u64) -> Factors {
     }
 
     if n == 1 {
+        #[cfg(feature="coz")]
+        coz::end!("factorization");
         return factors;
     }
 
     let (factors, n) = table::factor(n, factors);
 
-    if n < (1 << 32) {
+    let r = if n < (1 << 32) {
         _factor::<Montgomery<u32>>(n, factors)
     } else {
         _factor::<Montgomery<u64>>(n, factors)
-    }
+    };
+
+    #[cfg(feature="coz")]
+    coz::end!("factorization");
+
+    return r;
 }
 
 #[cfg(test)]
diff --git a/src/uu/factor/src/table.rs b/src/uu/factor/src/table.rs
index d6ef796fc..6291b92c1 100644
--- a/src/uu/factor/src/table.rs
+++ b/src/uu/factor/src/table.rs
@@ -33,6 +33,8 @@ pub(crate) fn factor(mut num: u64, mut factors: Factors) -> (Factors, u64) {
             if x <= ceil {
                 num = x;
                 k += 1;
+                #[cfg(feature="coz")]
+                coz::progress!("factor found");
             } else {
                 if k > 0 {
                     factors.add(prime, k);