diff --git a/appveyor.yml b/appveyor.yml
index a72c5f01f..1d671118b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -47,14 +47,6 @@ build_script:
 
     pip3 install -r requirements-win.txt
 
-    copy /Y %PYTHON_SITE%\PyQt5\Qt\bin\libeay32.dll .
-
-    copy /Y %PYTHON_SITE%\PyQt5\Qt\bin\ssleay32.dll .
-
-    copy /Y %PYTHON_SITE%\PyQt5\Qt\bin\libcrypto-1_1-x64.dll .
-
-    copy /Y %PYTHON_SITE%\PyQt5\Qt\bin\libssl-1_1-x64.dll .
-
     IF "%APPVEYOR_REPO_TAG%" == "false" python setup.py patch_version --platform=python%PYTHON_VERSION%
 
     python setup.py build
diff --git a/picard.spec b/picard.spec
index 4c90a0574..8b072cda2 100644
--- a/picard.spec
+++ b/picard.spec
@@ -48,15 +48,17 @@ data_files = get_locale_messages()
 
 fpcalc_name = 'fpcalc'
 if os_name == 'Windows':
+    from PyQt5.QtCore import QLibraryInfo
+    qt_binaries_path = QLibraryInfo.location(QLibraryInfo.BinariesPath)
     fpcalc_name = 'fpcalc.exe'
     binaries += [
         ('discid.dll', '.'),
         # The following two lines should not be neccasary with PyInstaller 3.5
-        ('libeay32.dll', '.'),
-        ('ssleay32.dll', '.'),
+        (os.path.join(qt_binaries_path, 'libeay32.dll'), '.'),
+        (os.path.join(qt_binaries_path, 'ssleay32.dll'), '.'),
         # The following two lines should not be neccasary with PyInstaller >3.5
-        ('libcrypto-1_1-x64.dll', '.'),
-        ('libssl-1_1-x64.dll', '.'),
+        (os.path.join(qt_binaries_path, 'libcrypto-1_1-x64.dll'), '.'),
+        (os.path.join(qt_binaries_path, 'libssl-1_1-x64.dll'), '.'),
     ]
     data_files.append((os.path.join('resources', 'win10', '*'), '.'))
 
@@ -105,7 +107,7 @@ coll = COLLECT(exe,
                name='picard')
 
 
-if platform.system() == 'Darwin':
+if os_name == 'Darwin':
     info_plist = {
         'NSHighResolutionCapable': 'True',
         'NSPrincipalClass': 'NSApplication',