diff --git a/Sources/fxios/Commands/L10n/L10nProduct.swift b/Sources/fxios/Commands/L10n/L10nProduct.swift
index 38f70e3..ef4a653 100644
--- a/Sources/fxios/Commands/L10n/L10nProduct.swift
+++ b/Sources/fxios/Commands/L10n/L10nProduct.swift
@@ -40,8 +40,8 @@ enum L10nProduct: String, ExpressibleByArgument, CaseIterable {
     /// Relative path from repo root to .xcodeproj
     var projectPath: String {
         switch self {
-        case .firefox: return "Client.xcodeproj"
-        case .focus: return "Blockzilla.xcodeproj"
+        case .firefox: return "firefox-ios/Client.xcodeproj"
+        case .focus: return "focus-ios/Blockzilla.xcodeproj"
         }
     }
 
diff --git a/Tests/fxiosTests/L10n/L10nProductTests.swift b/Tests/fxiosTests/L10n/L10nProductTests.swift
index 7ae400a..92287a1 100644
--- a/Tests/fxiosTests/L10n/L10nProductTests.swift
+++ b/Tests/fxiosTests/L10n/L10nProductTests.swift
@@ -59,9 +59,9 @@ struct L10nProductTests {
             #expect(L10nProduct.firefox.projectName == "Client.xcodeproj")
         }
 
-        @Test("Firefox projectPath is Client.xcodeproj")
+        @Test("Firefox projectPath is firefox-ios/Client.xcodeproj")
         func firefoxProjectPath() {
-            #expect(L10nProduct.firefox.projectPath == "Client.xcodeproj")
+            #expect(L10nProduct.firefox.projectPath == "firefox-ios/Client.xcodeproj")
         }
 
         @Test("Firefox skipWidgetKit is false")
@@ -95,9 +95,9 @@ struct L10nProductTests {
             #expect(L10nProduct.focus.projectName == "Blockzilla.xcodeproj")
         }
 
-        @Test("Focus projectPath is Blockzilla.xcodeproj")
+        @Test("Focus projectPath is focus-ios/Blockzilla.xcodeproj")
         func focusProjectPath() {
-            #expect(L10nProduct.focus.projectPath == "Blockzilla.xcodeproj")
+            #expect(L10nProduct.focus.projectPath == "focus-ios/Blockzilla.xcodeproj")
         }
 
         @Test("Focus skipWidgetKit is true")
@@ -106,6 +106,24 @@ struct L10nProductTests {
         }
     }
 
+    // MARK: - BuildProduct Parity
+
+    /// L10nProduct.projectPath must match BuildProduct.projectPath for the same product,
+    /// since both resolve against the same repo root. Drift caused issue #23.
+    @Suite("BuildProduct Parity")
+    struct BuildProductParityTests {
+
+        @Test("Firefox projectPath matches BuildProduct.firefox")
+        func firefoxProjectPathMatchesBuildProduct() {
+            #expect(L10nProduct.firefox.projectPath == BuildProduct.firefox.projectPath)
+        }
+
+        @Test("Focus projectPath matches BuildProduct.focus")
+        func focusProjectPathMatchesBuildProduct() {
+            #expect(L10nProduct.focus.projectPath == BuildProduct.focus.projectPath)
+        }
+    }
+
     // MARK: - Argument Parser Integration
 
     @Suite("ArgumentParser Integration")