diff --git a/ipdb/__main__.py b/ipdb/__main__.py
index b764e50..b2558b1 100644
--- a/ipdb/__main__.py
+++ b/ipdb/__main__.py
@@ -65,17 +65,18 @@ def wrap_sys_excepthook():
 
 
 def set_trace(frame=None, context=None, cond=True):
-    if cond:
-        wrap_sys_excepthook()
-        if not context:
-            context = os.environ.get(
-                "IPDB_CONTEXT_SIZE", get_context_from_config()
-            )
-        if frame is None:
-            frame = sys._getframe().f_back
-        p = _init_pdb(context).set_trace(frame)
-        if p and hasattr(p, 'shell'):
-            p.shell.restore_sys_module_state()
+    if not cond:
+        return
+    wrap_sys_excepthook()
+    if not context:
+        context = os.environ.get(
+            "IPDB_CONTEXT_SIZE", get_context_from_config()
+        )
+    if frame is None:
+        frame = sys._getframe().f_back
+    p = _init_pdb(context).set_trace(frame)
+    if p and hasattr(p, 'shell'):
+        p.shell.restore_sys_module_state()
 
 
 def get_context_from_config():