diff --git a/contrib/build-wine/deterministic.spec b/contrib/build-wine/deterministic.spec
index dafda1c99..b208ee169 100644
--- a/contrib/build-wine/deterministic.spec
+++ b/contrib/build-wine/deterministic.spec
@@ -78,6 +78,24 @@ for d in a.datas:
         a.datas.remove(d)
         break
 
+# Strip out parts of Qt that we never use. Reduces binary size by tens of MBs. see #4815
+qt_bins2remove=('qt5web', 'qt53d', 'qt5game', 'qt5designer', 'qt5quick',
+                'qt5location', 'qt5test', 'qt5xml', r'pyqt5\qt\qml\qtquick')
+print("Removing Qt binaries:", *qt_bins2remove)
+for x in a.binaries.copy():
+    for r in qt_bins2remove:
+        if x[0].lower().startswith(r):
+            a.binaries.remove(x)
+            print('----> Removed x =', x)
+
+qt_data2remove=(r'pyqt5\qt\translations\qtwebengine_locales', )
+print("Removing Qt datas:", *qt_data2remove)
+for x in a.datas.copy():
+    for r in qt_data2remove:
+        if x[0].lower().startswith(r):
+            a.datas.remove(x)
+            print('----> Removed x =', x)
+
 # hotfix for #3171 (pre-Win10 binaries)
 a.binaries = [x for x in a.binaries if not x[1].lower().startswith(r'c:\windows')]
 
diff --git a/contrib/osx/osx.spec b/contrib/osx/osx.spec
index ac9c07a0e..7b56d6f46 100644
--- a/contrib/osx/osx.spec
+++ b/contrib/osx/osx.spec
@@ -81,6 +81,15 @@ for d in a.datas:
         a.datas.remove(d)
         break
 
+# Strip out parts of Qt that we never use. Reduces binary size by tens of MBs. see #4815
+qt_bins2remove=('qtweb', 'qt3d', 'qtgame', 'qtdesigner', 'qtquick', 'qtlocation', 'qttest', 'qtxml')
+print("Removing Qt binaries:", *qt_bins2remove)
+for x in a.binaries.copy():
+    for r in qt_bins2remove:
+        if x[0].lower().startswith(r):
+            a.binaries.remove(x)
+            print('----> Removed x =', x)
+
 pyz = PYZ(a.pure, a.zipped_data, cipher=block_cipher)
 
 exe = EXE(pyz,