diff --git a/Cargo.lock b/Cargo.lock
index 52013e493..7c3fa7eb0 100644
Binary files a/Cargo.lock and b/Cargo.lock differ
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index 484730952..ee6d52af2 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -30,6 +30,7 @@ glob = "0.3.0"
 html-escape = "0.2.6"
 indexmap = "1"
 lazy_static = "1.2.0"
+path-slash = "0.2.1"
 regex = "1"
 regex-syntax = "0.6.4"
 rustc-hash = "1"
diff --git a/cli/src/wasm.rs b/cli/src/wasm.rs
index 467fef713..35f09b556 100644
--- a/cli/src/wasm.rs
+++ b/cli/src/wasm.rs
@@ -1,5 +1,6 @@
 use super::generate::parse_grammar::GrammarJSON;
 use anyhow::{anyhow, Context, Result};
+use path_slash::PathExt as _;
 use std::ffi::{OsStr, OsString};
 use std::fs;
 use std::path::Path;
@@ -41,7 +42,7 @@ pub fn compile_language_to_wasm(language_dir: &Path, force_docker: bool) -> Resu
             volume_string = OsString::from(parent);
             volume_string.push(":/src:Z");
             command.arg("--workdir");
-            command.arg(&Path::new("/src").join(filename));
+            command.arg(Path::new("/src").join(filename).to_slash_lossy().as_ref());
         } else {
             volume_string = OsString::from(language_dir);
             volume_string.push(":/src:Z");
@@ -103,14 +104,18 @@ pub fn compile_language_to_wasm(language_dir: &Path, force_docker: bool) -> Resu
     let scanner_cpp_path = src.join("scanner.cpp");
 
     if language_dir.join(&scanner_cc_path).exists() {
-        command.arg("-xc++").arg(&scanner_cc_path);
+        command
+            .arg("-xc++")
+            .arg(scanner_cc_path.to_slash_lossy().as_ref());
     } else if language_dir.join(&scanner_cpp_path).exists() {
-        command.arg("-xc++").arg(&scanner_cpp_path);
+        command
+            .arg("-xc++")
+            .arg(scanner_cpp_path.to_slash_lossy().as_ref());
     } else if language_dir.join(&scanner_c_path).exists() {
-        command.arg(&scanner_c_path);
+        command.arg(scanner_c_path.to_slash_lossy().as_ref());
     }
 
-    command.arg(&parser_c_path);
+    command.arg(parser_c_path.to_slash_lossy().as_ref());
 
     let output = command
         .output()