diff --git a/pkgs/development/python-modules/cairocffi/default.nix b/pkgs/development/python-modules/cairocffi/default.nix
index a9c4a3437b5..13d00d0529c 100644
--- a/pkgs/development/python-modules/cairocffi/default.nix
+++ b/pkgs/development/python-modules/cairocffi/default.nix
@@ -1,5 +1,6 @@
 # FIXME: make gdk_pixbuf dependency optional
-{ buildPythonPackage
+{ stdenv
+, buildPythonPackage
 , fetchPypi
 , lib
 , substituteAll
@@ -42,6 +43,7 @@ buildPythonPackage rec {
     # OSError: dlopen() failed to load a library: gdk_pixbuf-2.0 / gdk_pixbuf-2.0-0
     (substituteAll {
       src = ./dlopen-paths.patch;
+      ext = stdenv.hostPlatform.extensions.sharedLibrary;
       cairo = cairo.out;
       glib = glib.out;
       gdk_pixbuf = gdk_pixbuf.out;
diff --git a/pkgs/development/python-modules/cairocffi/dlopen-paths.patch b/pkgs/development/python-modules/cairocffi/dlopen-paths.patch
index bc5e939ceba..862f7bd4bf7 100644
--- a/pkgs/development/python-modules/cairocffi/dlopen-paths.patch
+++ b/pkgs/development/python-modules/cairocffi/dlopen-paths.patch
@@ -16,10 +16,10 @@ index 718aa7f..1a1dcff 100644
  
 +# Use hardcoded soname, because ctypes.util use gcc/objdump which shouldn't be required for runtime
 +_LIBS = {
-+    'cairo': '@cairo@/lib/libcairo.so.2',
-+    'glib-2.0': '@glib@/lib/libglib-2.0.so.0',
-+    'gobject-2.0': '@glib@/lib/libgobject-2.0.so.0',
-+    'gdk_pixbuf-2.0': '@gdk_pixbuf@/lib/libgdk_pixbuf-2.0.so.0',
++    'cairo': '@cairo@/lib/libcairo@ext@',
++    'glib-2.0': '@glib@/lib/libglib-2.0@ext@',
++    'gobject-2.0': '@glib@/lib/libgobject-2.0@ext@',
++    'gdk_pixbuf-2.0': '@gdk_pixbuf@/lib/libgdk_pixbuf-2.0@ext@',
 +}
  
 -def dlopen(ffi, *names):