diff --git a/run_project_tests.py b/run_project_tests.py
index 0bf5f31d1..d442dd326 100755
--- a/run_project_tests.py
+++ b/run_project_tests.py
@@ -185,6 +185,7 @@ def get_relative_files_list_from_dir(fromdir):
 def platform_fix_name(fname, compiler):
     if '?lib' in fname:
         if mesonlib.is_cygwin():
+            fname = re.sub(r'lib/\?lib(.*)\.so$', r'bin/cyg\1.dll', fname)
             fname = re.sub(r'\?lib(.*)\.dll$', r'cyg\1.dll', fname)
         else:
             fname = re.sub(r'\?lib', 'lib', fname)
diff --git a/test cases/frameworks/11 gir subproject/installed_files.txt b/test cases/frameworks/11 gir subproject/installed_files.txt
index 434481ebe..87d49a1b3 100644
--- a/test cases/frameworks/11 gir subproject/installed_files.txt	
+++ b/test cases/frameworks/11 gir subproject/installed_files.txt	
@@ -2,5 +2,5 @@ usr/lib/girepository-1.0/Meson-1.0.typelib
 usr/lib/girepository-1.0/MesonSub-1.0.typelib
 usr/share/gir-1.0/Meson-1.0.gir
 usr/share/gir-1.0/MesonSub-1.0.gir
-usr/lib/libgirsubproject.so
-usr/lib/libgirlib.so
+usr/lib/?libgirsubproject.so
+usr/lib/?libgirlib.so
diff --git a/test cases/frameworks/12 multiple gir/installed_files.txt b/test cases/frameworks/12 multiple gir/installed_files.txt
index 9fb51bf59..a5d16bca2 100644
--- a/test cases/frameworks/12 multiple gir/installed_files.txt	
+++ b/test cases/frameworks/12 multiple gir/installed_files.txt	
@@ -1,6 +1,6 @@
 usr/lib/girepository-1.0/Meson-1.0.typelib
 usr/lib/girepository-1.0/MesonSub-1.0.typelib
-usr/lib/libgirlib.so
-usr/lib/libgirsubproject.so
+usr/lib/?libgirlib.so
+usr/lib/?libgirsubproject.so
 usr/share/gir-1.0/Meson-1.0.gir
 usr/share/gir-1.0/MesonSub-1.0.gir
diff --git a/test cases/frameworks/7 gnome/installed_files.txt b/test cases/frameworks/7 gnome/installed_files.txt
index d0d51d51b..c7c704ffa 100644
--- a/test cases/frameworks/7 gnome/installed_files.txt	
+++ b/test cases/frameworks/7 gnome/installed_files.txt	
@@ -2,9 +2,9 @@ usr/include/enums.h
 usr/include/enums2.h
 usr/include/enums3.h
 usr/include/marshaller.h
-usr/lib/libgir_lib.so
-usr/lib/libdep1lib.so
-usr/lib/libdep2lib.so
+usr/lib/?libgir_lib.so
+usr/lib/?libdep1lib.so
+usr/lib/?libdep2lib.so
 usr/lib/girepository-1.0/Meson-1.0.typelib
 usr/lib/girepository-1.0/MesonDep1-1.0.typelib
 usr/lib/girepository-1.0/MesonDep2-1.0.typelib
diff --git a/test cases/vala/11 generated vapi/installed_files.txt b/test cases/vala/11 generated vapi/installed_files.txt
index 5993d0161..aeaf2da7d 100644
--- a/test cases/vala/11 generated vapi/installed_files.txt	
+++ b/test cases/vala/11 generated vapi/installed_files.txt	
@@ -1,6 +1,6 @@
 usr/bin/vapigen-test
-usr/lib/libfoo.so
-usr/lib/libbar.so
+usr/lib/?libfoo.so
+usr/lib/?libbar.so
 usr/share/vala/vapi/foo-1.0.vapi
 usr/share/vala/vapi/foo-1.0.deps
 usr/share/vala/vapi/bar-1.0.vapi
diff --git a/test cases/vala/7 shared library/installed_files.txt b/test cases/vala/7 shared library/installed_files.txt
index f70e439db..012b107d5 100644
--- a/test cases/vala/7 shared library/installed_files.txt	
+++ b/test cases/vala/7 shared library/installed_files.txt	
@@ -1,5 +1,5 @@
-usr/lib/libinstalled_vala_lib.so
-usr/lib/libinstalled_vala_all.so
+usr/lib/?libinstalled_vala_lib.so
+usr/lib/?libinstalled_vala_all.so
 usr/include/installed_vala_all.h
 usr/include/valah/installed_vala_all_nolib.h
 usr/include/installed_vala_onlyh.h
diff --git a/test cases/vala/9 gir/installed_files.txt b/test cases/vala/9 gir/installed_files.txt
index 7a0e05505..64bddeec1 100644
--- a/test cases/vala/9 gir/installed_files.txt	
+++ b/test cases/vala/9 gir/installed_files.txt	
@@ -1,2 +1,2 @@
-usr/lib/libfoo.so
+usr/lib/?libfoo.so
 usr/share/gir-1.0/Foo-1.0.gir