diff --git a/dangerzone/util.py b/dangerzone/util.py
index 311288c..bbedfdb 100644
--- a/dangerzone/util.py
+++ b/dangerzone/util.py
@@ -1,3 +1,4 @@
+import os
 import pathlib
 import platform
 import subprocess
@@ -45,6 +46,26 @@ def get_resource_path(filename: str) -> str:
     return str(resource_path)
 
 
+def get_tessdata_dir() -> str:
+    if (
+        getattr(sys, "dangerzone_dev", False)
+        or platform.system() == "Windows"
+        or platform.system() == "Darwin"
+    ):
+        # Always use the tessdata path from the Dangerzone ./share directory, for
+        # development builds, or in Windows/macOS platforms.
+        return get_resource_path("tessdata")
+
+    fedora_tessdata_dir = "/usr/share/tesseract/tessdata/"
+    debian_tessdata_dir = "/usr/share/tessdata/"
+    if os.path.isdir(fedora_tessdata_dir):
+        return fedora_tessdata_dir
+    if os.path.isdir(debian_tessdata_dir):
+        return debian_tessdata_dir
+    else:
+        raise RuntimeError("Tesseract language data are not installed in the system")
+
+
 def get_version() -> str:
     try:
         with open(get_resource_path("version.txt")) as f:
diff --git a/tests/test_ocr.py b/tests/test_ocr.py
index 29d50f8..1335df4 100644
--- a/tests/test_ocr.py
+++ b/tests/test_ocr.py
@@ -1,59 +1,24 @@
+import pathlib
 import platform
 import subprocess
 from pathlib import Path
 
 import pytest
 
-from dangerzone.isolation_provider.container import Container
-from dangerzone.isolation_provider.qubes import is_qubes_native_conversion
+from dangerzone.isolation_provider.dummy import Dummy
 from dangerzone.logic import DangerzoneCore
+from dangerzone.util import get_tessdata_dir
 
 
-# TODO: Perform an equivalent test on Qubes.
-# NOTE: We skip running this test on Windows/MacOS, because our current CI cannot run
-# Docker in these platforms. It's not a problem anyways, because the result should be
-# the same in all container-based platforms.
-@pytest.mark.skipif(
-    platform.system() != "Linux" or is_qubes_native_conversion(),
-    reason="Container-specific",
-)
-def test_ocr_omissions() -> None:
-    # Create the command that will list all the installed languages in the container
-    # image.
-    command = [Container.get_runtime(), "run"]
-    command += Container.get_runtime_security_args()
-    command += [
-        Container.CONTAINER_NAME,
-        "find",
-        "/usr/share/tessdata/",
-        "-name",
-        "*.traineddata",
-    ]
-
-    # Run the command, strip any extra whitespace, and remove the following first line
-    # from the result:
-    #
-    #     List of available languages in "/usr/share/tessdata/" ...
-    installed_langs_filenames = (
-        subprocess.run(command, text=True, check=True, stdout=subprocess.PIPE)
-        .stdout.strip()
-        .split("\n")
-    )
-    installed_langs = set(
-        [
-            Path(filename).name.split(".traineddata")[0]
-            for filename in installed_langs_filenames
-        ]
-    )
-
-    # Remove the "osd" and "equ" languages from the list of installed languages, since
-    # they are not an actual language. Read more in:
-    # https://pyimagesearch.com/2021/11/15/tesseract-page-segmentation-modes-psms-explained-how-to-improve-your-ocr-accuracy/
-    installed_langs -= {"osd", "equ"}
+def test_ocr_ommisions() -> None:
+    # Grab the languages that are available in the Tesseract data dir.
+    tessdata_dir = pathlib.Path(get_tessdata_dir())
+    suffix_len = len(".traineddata")
+    available_langs = {f.name[:-suffix_len] for f in tessdata_dir.iterdir()}
 
     # Grab the languages that Dangerzone offers to the user through the GUI/CLI.
-    offered_langs = set(DangerzoneCore(Container()).ocr_languages.values())
+    offered_langs = set(DangerzoneCore(Dummy()).ocr_languages.values())
 
-    # Ensure that both the installed languages and the ones we offer to the user are the
+    # Ensure that both the available languages and the ones we offer to the user are the
     # same.
-    assert installed_langs == offered_langs
+    assert available_langs == offered_langs