diff --git a/src/core/copyjob.cpp b/src/core/copyjob.cpp
--- a/src/core/copyjob.cpp
+++ b/src/core/copyjob.cpp
@@ -1598,6 +1598,7 @@
     Q_Q(CopyJob);
     bool bCopyFile = false;
     qCDebug(KIO_COPYJOB_DEBUG);
+    const auto fileSystem = KFileSystemType::fileSystemType(m_globalDest.toString());
     // Take the first file in the list
     QList<CopyInfo>::Iterator it = files.begin();
     // Is this URL on the skip list ?
@@ -1617,7 +1618,13 @@
                 q->emitResult();
                 return;
             }
-            //TODO check if dst mount is msdos and (*it).size exceeds it's limits
+
+            if (fileSystem == KFileSystemType::Fat && (*it).size > 4294967296) { // 4 GB = 4294967296 Bytes
+                q->setError(ERR_FILE_TOO_LARGE_FOR_FAT32);
+                q->setErrorText(m_globalDest.toDisplayString());
+                q->emitResult();
+                return;
+            }
         }
 
         const QUrl &uSource = (*it).uSource;
diff --git a/src/core/global.h b/src/core/global.h
--- a/src/core/global.h
+++ b/src/core/global.h
@@ -245,7 +245,8 @@
     ERR_DROP_ON_ITSELF = KJob::UserDefinedError + 70, ///< from KIO::DropJob, @since 5.6
     ERR_CANNOT_MOVE_INTO_ITSELF = KJob::UserDefinedError + 71, ///< emitted by KIO::move, @since 5.18
     ERR_PASSWD_SERVER = KJob::UserDefinedError + 72, ///< returned by SlaveBase::openPasswordDialogV2, @since 5.24
-    ERR_CANNOT_CREATE_SLAVE = KJob::UserDefinedError + 73 ///< used by Slave::createSlave, @since 5.30
+    ERR_CANNOT_CREATE_SLAVE = KJob::UserDefinedError + 73, ///< used by Slave::createSlave, @since 5.30
+    ERR_FILE_TOO_LARGE_FOR_FAT32 = KJob::UserDefinedError + 74
 };
 
 /**
diff --git a/src/core/job_error.cpp b/src/core/job_error.cpp
--- a/src/core/job_error.cpp
+++ b/src/core/job_error.cpp
@@ -245,8 +245,12 @@
     case KIO::ERR_CANNOT_CREATE_SLAVE:
         result = i18n("Unable to create io-slave. %1", errorText);
         break;
+    case KIO::ERR_FILE_TOO_LARGE_FOR_FAT32:
+        result = i18n("The file named %1 cannot be transferred because its size is greater than 4 GB,"
+                      " and the destination's filesystem does not support files that large.", errorText);
+        break;
     default:
-        result = i18n("Unknown error code %1\n%2\nPlease send a full bug report at https://bugs.kde.org.",  errorCode,  errorText);
+        result = i18n("Unknown error code %1\n%2\nPlease send a full bug report at http://bugs.kde.org.",  errorCode,  errorText);
         break;
     }