diff --git a/src/apps/debug/__init__.py b/src/apps/debug/__init__.py
index efa585411..a880a7984 100644
--- a/src/apps/debug/__init__.py
+++ b/src/apps/debug/__init__.py
@@ -1,42 +1,41 @@
-from trezor import loop, utils
-from trezor.messages import wire_types
-from trezor.messages.DebugLinkState import DebugLinkState
-from trezor.ui import confirm, swipe
-from trezor.wire import register, protobuf_workflow
-from apps.common import storage
-
 if not __debug__:
-    utils.halt("debug mode inactive")
+    from trezor.utils import halt
+    halt("debug mode inactive")
 
-reset_internal_entropy = None
-reset_current_words = None
-reset_word_index = None
+if __debug__:
+    from trezor import loop
+    from trezor.messages import wire_types
+    from trezor.messages.DebugLinkState import DebugLinkState
+    from trezor.ui import confirm, swipe
+    from trezor.wire import register, protobuf_workflow
+    from apps.common import storage
 
-confirm_signal = loop.signal()
-swipe_signal = loop.signal()
-input_signal = loop.signal()
+    reset_internal_entropy = None
+    reset_current_words = None
+    reset_word_index = None
 
+    confirm_signal = loop.signal()
+    swipe_signal = loop.signal()
+    input_signal = loop.signal()
 
-async def dispatch_DebugLinkDecision(ctx, msg):
-    if msg.yes_no is not None:
-        confirm_signal.send(confirm.CONFIRMED if msg.yes_no else confirm.CANCELLED)
-    if msg.up_down is not None:
-        swipe_signal.send(swipe.SWIPE_DOWN if msg.up_down else swipe.SWIPE_UP)
-    if msg.input is not None:
-        input_signal.send(msg.input)
+    async def dispatch_DebugLinkDecision(ctx, msg):
+        if msg.yes_no is not None:
+            confirm_signal.send(confirm.CONFIRMED if msg.yes_no else confirm.CANCELLED)
+        if msg.up_down is not None:
+            swipe_signal.send(swipe.SWIPE_DOWN if msg.up_down else swipe.SWIPE_UP)
+        if msg.input is not None:
+            input_signal.send(msg.input)
 
+    async def dispatch_DebugLinkGetState(ctx, msg):
+        m = DebugLinkState()
+        m.mnemonic = storage.get_mnemonic()
+        m.passphrase_protection = storage.has_passphrase()
+        m.reset_word_pos = reset_word_index
+        m.reset_entropy = reset_internal_entropy
+        if reset_current_words:
+            m.reset_word = ' '.join(reset_current_words)
+        return m
 
-async def dispatch_DebugLinkGetState(ctx, msg):
-    m = DebugLinkState()
-    m.mnemonic = storage.get_mnemonic()
-    m.passphrase_protection = storage.has_passphrase()
-    m.reset_word_pos = reset_word_index
-    m.reset_entropy = reset_internal_entropy
-    if reset_current_words:
-        m.reset_word = ' '.join(reset_current_words)
-    return m
-
-
-def boot():
-    register(wire_types.DebugLinkDecision, protobuf_workflow, dispatch_DebugLinkDecision)
-    register(wire_types.DebugLinkGetState, protobuf_workflow, dispatch_DebugLinkGetState)
+    def boot():
+        register(wire_types.DebugLinkDecision, protobuf_workflow, dispatch_DebugLinkDecision)
+        register(wire_types.DebugLinkGetState, protobuf_workflow, dispatch_DebugLinkGetState)