diff --git a/requirements.txt b/requirements.txt
index 55872de4a0..4b5d348b43 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -407,6 +407,10 @@ pywin32-ctypes==0.2.0; \
 charset-normalizer==2.1.0; \
     --hash=sha256:5189b6f22b01957427f35b6a08d9a0bc45b46d3788ef5a92e978433c7a35f8a5
 
-pynavlib==0.9.1; \
-    --hash=sha256:92f9cb4a1b8c081fed1c3b6805fd603c189c4985b8a87aa4bebb07cf9c532e4d \ 
-    --hash=sha256:085e461863d62c735c8cb76b2e5b60dbc35683820bd348cb38a70e26f69cb32b
+pynavlib==0.9.1 \
+    --hash=sha256:92f9cb4a1b8c081fed1c3b6805fd603c189c4985b8a87aa4bebb07cf9c532e4d \
+    ; sys_platform == "darwin"
+
+pynavlib==0.9.1 \
+    --hash=sha256:085e461863d62c735c8cb76b2e5b60dbc35683820bd348cb38a70e26f69cb32b \
+    ; sys_platform == "win32"