diff --git a/src/steps/os/windows.rs b/src/steps/os/windows.rs
index cfd852a2..e253ae9f 100644
--- a/src/steps/os/windows.rs
+++ b/src/steps/os/windows.rs
@@ -149,12 +149,12 @@ fn upgrade_wsl_distribution(wsl: &Path, dist: &str, ctx: &ExecutionContext) -> R
     //
     // ```rust
     // command
-    //  .args(["-d", dist, "bash", "-c"])
+    //  .args(["-d", dist, "bash", "-lc"])
     //  .arg(format!("TOPGRADE_PREFIX={dist} exec {topgrade}"));
     // ```
     //
     // creates a command string like:
-    // > `C:\WINDOWS\system32\wsl.EXE -d Ubuntu bash -c 'TOPGRADE_PREFIX=Ubuntu exec /bin/topgrade'`
+    // > `C:\WINDOWS\system32\wsl.EXE -d Ubuntu bash -lc 'TOPGRADE_PREFIX=Ubuntu exec /bin/topgrade'`
     //
     // Adding the following:
     //
@@ -163,7 +163,7 @@ fn upgrade_wsl_distribution(wsl: &Path, dist: &str, ctx: &ExecutionContext) -> R
     // ```
     //
     // appends the next argument like so:
-    // > `C:\WINDOWS\system32\wsl.EXE -d Ubuntu bash -c 'TOPGRADE_PREFIX=Ubuntu exec /bin/topgrade' -v`
+    // > `C:\WINDOWS\system32\wsl.EXE -d Ubuntu bash -lc 'TOPGRADE_PREFIX=Ubuntu exec /bin/topgrade' -v`
     // which means `-v` isn't passed to `topgrade`.
     let mut args = String::new();
     if ctx.config().verbose() {
@@ -171,7 +171,7 @@ fn upgrade_wsl_distribution(wsl: &Path, dist: &str, ctx: &ExecutionContext) -> R
     }
 
     command
-        .args(["-d", dist, "bash", "-c"])
+        .args(["-d", dist, "bash", "-lc"])
         .arg(format!("TOPGRADE_PREFIX={dist} exec {topgrade} {args}"));
 
     if ctx.config().yes(Step::Wsl) {