diff --git a/src/plugins/platforms/cocoa/qcocoahelpers.h b/src/plugins/platforms/cocoa/qcocoahelpers.h
index 456129ffec5..22ea569c673 100644
--- a/src/plugins/platforms/cocoa/qcocoahelpers.h
+++ b/src/plugins/platforms/cocoa/qcocoahelpers.h
@@ -178,10 +178,6 @@ T qt_mac_resolveOption(const T &fallback, QWindow *window, const QByteArray &pro
 
 // -------------------------------------------------------------------------
 
-#if QT_POINTER_SIZE == 4
-#error "32-bit builds are not supported"
-#endif
-
 class QMacVersion
 {
 public:
diff --git a/src/plugins/platforms/cocoa/qcocoahelpers.mm b/src/plugins/platforms/cocoa/qcocoahelpers.mm
index 240f184be47..2048bccf657 100644
--- a/src/plugins/platforms/cocoa/qcocoahelpers.mm
+++ b/src/plugins/platforms/cocoa/qcocoahelpers.mm
@@ -406,7 +406,9 @@ QMacVersion::VersionTuple QMacVersion::versionsForImage(const mach_header *machH
         );
     };
 
-    auto commandCursor = uintptr_t(machHeader) + sizeof(mach_header_64);
+    const bool is64Bit = machHeader->magic == MH_MAGIC_64 || machHeader->magic == MH_CIGAM_64;
+    auto commandCursor = uintptr_t(machHeader) + (is64Bit ? sizeof(mach_header_64) : sizeof(mach_header));
+
     for (uint32_t i = 0; i < machHeader->ncmds; ++i) {
         load_command *loadCommand = reinterpret_cast<load_command *>(commandCursor);
         if (loadCommand->cmd == LC_VERSION_MIN_MACOSX) {