diff --git a/src/plugins/sqldrivers/ibase/qsql_ibase.cpp b/src/plugins/sqldrivers/ibase/qsql_ibase.cpp
index 6fbdef26957..484dad6e1dd 100644
--- a/src/plugins/sqldrivers/ibase/qsql_ibase.cpp
+++ b/src/plugins/sqldrivers/ibase/qsql_ibase.cpp
@@ -1845,9 +1845,9 @@ bool QIBaseDriver::subscribeToNotification(const QString &name)
                    eBuffer->bufferLength,
                    eBuffer->eventBuffer,
 #if defined (FB_API_VER) && FB_API_VER >= 20
-                   (ISC_EVENT_CALLBACK)qEventCallback,
+                   reinterpret_cast<ISC_EVENT_CALLBACK>(qEventCallback),
 #else
-                   (isc_callback)qEventCallback,
+                   reinterpret_cast<isc_callback>(qEventCallback),
 #endif
                    eBuffer->resultBuffer);
 
@@ -1925,9 +1925,9 @@ void QIBaseDriver::qHandleEventNotification(void *updatedResultBuffer)
                            eBuffer->bufferLength,
                            eBuffer->eventBuffer,
 #if defined (FB_API_VER) && FB_API_VER >= 20
-                                    (ISC_EVENT_CALLBACK)qEventCallback,
+                                    reinterpret_cast<ISC_EVENT_CALLBACK>(qEventCallback),
 #else
-                                    (isc_callback)qEventCallback,
+                                    reinterpret_cast<isc_callback>(qEventCallback),
 #endif
                                    eBuffer->resultBuffer);
             if (Q_UNLIKELY(status[0] == 1 && status[1])) {