diff --git a/nix/mobile/jsbundle/default.nix b/nix/mobile/jsbundle/default.nix
index 8b6bb025f1..666dfb8300 100644
--- a/nix/mobile/jsbundle/default.nix
+++ b/nix/mobile/jsbundle/default.nix
@@ -67,9 +67,12 @@ stdenv.mkDerivation {
   '';
   buildPhase = ''
     # Assemble CLASSPATH from available clojure dependencies.
-    # We append 'src' so it can find the local sources.
-    export CLASS_PATH="$(find ${deps.clojure} \
-      -iname '*.jar' | tr '\n' ':')src"
+    # We prepend 'src' so it can find the local sources and prioritize
+    # our own namespaces over dependencies, given that indirect dependencies
+    # can also cause naming conflicts (e.g. prismatic/schema already uses
+    # namespace schema.core).
+    export CLASS_PATH="src:$(find ${deps.clojure} \
+      -iname '*.jar' | tr '\n' ':')"
 
     # target must be one of the builds defined in shadow-cljs.edn
     java -cp "$CLASS_PATH" clojure.main \