diff --git a/core/Makefile b/core/Makefile
index 08b172287..325659da6 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -105,11 +105,14 @@ build_firmware: res build_cross ## build firmware with frozen modules
 build_unix: res ## build unix port
 	$(SCONS) CFLAGS="$(CFLAGS)" $(UNIX_BUILD_DIR)/micropython $(UNIX_PORT_OPTS)
 
+build_unix_frozen: res build_cross ## build unix port with frozen modules
+	$(SCONS) CFLAGS="$(CFLAGS)" $(UNIX_BUILD_DIR)/micropython $(UNIX_PORT_OPTS) TREZOR_EMULATOR_FROZEN=1
+
 build_unix_noui: res ## build unix port without UI support
 	$(SCONS) CFLAGS="$(CFLAGS)" $(UNIX_BUILD_DIR)/micropython $(UNIX_PORT_OPTS) TREZOR_EMULATOR_NOUI=1
 
 build_unix_noui_frozen: res build_cross ## build unix port without UI support with frozen modules
-	$(SCONS) CFLAGS="$(CFLAGS)" $(UNIX_BUILD_DIR)/micropython $(UNIX_PORT_OPTS) TREZOR_EMULATOR_NOUI=1 TREZOR_FROZEN=1
+	$(SCONS) CFLAGS="$(CFLAGS)" $(UNIX_BUILD_DIR)/micropython $(UNIX_PORT_OPTS) TREZOR_EMULATOR_NOUI=1 TREZOR_EMULATOR_FROZEN=1
 
 build_unix_raspi: res ## build unix port for Raspberry Pi
 	$(SCONS) CFLAGS="$(CFLAGS)" $(UNIX_BUILD_DIR)/micropython $(UNIX_PORT_OPTS) TREZOR_EMULATOR_RASPI=1
diff --git a/core/SConscript.unix b/core/SConscript.unix
index af305ba53..1bb0409c9 100644
--- a/core/SConscript.unix
+++ b/core/SConscript.unix
@@ -8,6 +8,8 @@ CPPDEFINES_MOD = []
 SOURCE_MOD = []
 SOURCE_MOD_SECP256K1_ZKP = []
 
+PYOPT = '1'
+
 # modtrezorconfig
 CPPPATH_MOD += [
     'embed/extmod/modtrezorconfig',
@@ -134,6 +136,8 @@ if ARGUMENTS.get('TREZOR_EMULATOR_NOUI', 0):
     CPPDEFINES_MOD += ['TREZOR_EMULATOR_NOUI']
 if ARGUMENTS.get('TREZOR_EMULATOR_RASPI', 0):
     CPPDEFINES_MOD += ['TREZOR_EMULATOR_RASPI']
+if ARGUMENTS.get('TREZOR_EMULATOR_FROZEN', 0):
+    CPPDEFINES_MOD += ['TREZOR_EMULATOR_FROZEN']
 
 # modtrezorutils
 SOURCE_MOD += [
@@ -286,7 +290,7 @@ SOURCE_UNIX = [
 
 SOURCE_QSTR = SOURCE_MOD + SOURCE_MICROPYTHON + SOURCE_UNIX
 
-env = Environment(ENV=os.environ, CFLAGS=ARGUMENTS.get('CFLAGS', ''))
+env = Environment(ENV=os.environ, CFLAGS='%s -DPYOPT=%s' % (ARGUMENTS.get('CFLAGS', ''), PYOPT))
 
 env.Tool('micropython')
 
@@ -313,7 +317,7 @@ env.Replace(
 
 env.Replace(
     COPT=env.get('OPTIMIZE', env.get('ENV').get('OPTIMIZE', '-Os')),
-    CCFLAGS='$COPT -DMPZ_DIG_SIZE=16 '
+    CCFLAGS='$COPT '
     '-g3 '
     '-std=gnu99 -Wall -Werror -Wuninitialized '
     '-fdata-sections -ffunction-sections ' + CCFLAGS_MOD,
@@ -343,7 +347,8 @@ env.Replace(
     MAKEQSTRDATA='$PYTHON vendor/micropython/py/makeqstrdata.py',
     MAKEVERSIONHDR='$PYTHON vendor/micropython/py/makeversionhdr.py',
     MPY_TOOL='$PYTHON vendor/micropython/tools/mpy-tool.py',
-    MPY_CROSS='vendor/micropython/mpy-cross/mpy-cross', )
+    MPY_CROSS='vendor/micropython/mpy-cross/mpy-cross -O' + PYOPT
+)
 
 #
 # Micropython version
@@ -376,7 +381,7 @@ env.Ignore(qstr_collected, qstr_generated)
 # Frozen modules
 #
 
-if ARGUMENTS.get('TREZOR_FROZEN', 0):
+if ARGUMENTS.get('TREZOR_EMULATOR_FROZEN', 0):
     if env.get('TREZOR_MODEL') == '1':
         SOURCE_PY_DIR = 'src1/'
     else:
@@ -426,7 +431,7 @@ obj_program.extend(env.Object(source=SOURCE_MOD))
 obj_program.extend(env.Object(source=SOURCE_MOD_SECP256K1_ZKP, CCFLAGS='$CCFLAGS -Wno-unused-function'))
 obj_program.extend(env.Object(source=SOURCE_MICROPYTHON))
 obj_program.extend(env.Object(source=SOURCE_UNIX))
-if ARGUMENTS.get('TREZOR_FROZEN', 0):
+if ARGUMENTS.get('TREZOR_EMULATOR_FROZEN', 0):
     obj_program.extend(env.Object(source=source_mpyc))
 
 env.Depends(obj_program, qstr_generated)
diff --git a/core/embed/unix/mpconfigport.h b/core/embed/unix/mpconfigport.h
index 3ea011c1d..94179a6f0 100644
--- a/core/embed/unix/mpconfigport.h
+++ b/core/embed/unix/mpconfigport.h
@@ -28,6 +28,13 @@
 
 // options to control how MicroPython is built
 
+#ifdef TREZOR_EMULATOR_FROZEN
+#define MICROPY_QSTR_EXTRA_POOL (mp_qstr_frozen_const_pool)
+#define MICROPY_MODULE_FROZEN_MPY (1)
+#endif
+
+#define MPZ_DIG_SIZE (16)
+
 #define MICROPY_ALLOC_PATH_MAX (PATH_MAX)
 #define MICROPY_PERSISTENT_CODE_LOAD (1)
 #if !defined(MICROPY_EMIT_X64) && defined(__x86_64__)