diff --git a/core/emu.py b/core/emu.py
index a227bf374..95432b8be 100755
--- a/core/emu.py
+++ b/core/emu.py
@@ -217,6 +217,7 @@ def cli(
         TREZOR_PROFILE_DIR=str(profile_dir.resolve()),
         TREZOR_UDP_PORT=str(emulator.port),
         TREZOR_FIDO2_UDP_PORT=str(emulator.port + 2),
+        TREZOR_SRC=str(SRC_DIR),
     )
     os.environ.update(emulator_env)
     for k, v in emulator_env.items():
diff --git a/core/prof/prof.py b/core/prof/prof.py
index 6839fe000..75703ed05 100644
--- a/core/prof/prof.py
+++ b/core/prof/prof.py
@@ -1,11 +1,14 @@
 import sys
 
 from uio import open
+from uos import getenv
 
 # We need to insert "" to sys.path so that the frozen build can import main from the
 # frozen modules, and regular build can import it from current directory.
 sys.path.insert(0, "")
 
+PATH_PREFIX = (getenv("TREZOR_SRC") or ".") + "/"
+
 
 class Coverage:
     def __init__(self):
@@ -22,7 +25,7 @@ class Coverage:
         this_file = globals()["__file__"]
         for filename in self.__files:
             if not filename == this_file:
-                lines[filename] = list(self.__files[filename])
+                lines[PATH_PREFIX + filename] = list(self.__files[filename])
 
         return lines_execution