diff --git a/src/karecurrence.h b/src/karecurrence.h
--- a/src/karecurrence.h
+++ b/src/karecurrence.h
@@ -90,7 +90,7 @@
      * Assignment operator.
      * @param r the recurrence which will be assigned to this.
      */
-    KARecurrence &operator=(const KARecurrence &r);
+    KARecurrence &operator=(const KARecurrence &r) = delete;
 
     /**
      * Comparison operator for equality.
diff --git a/src/karecurrence.cpp b/src/karecurrence.cpp
--- a/src/karecurrence.cpp
+++ b/src/karecurrence.cpp
@@ -42,11 +42,7 @@
     Recurrence_p() : Recurrence() {}
     Recurrence_p(const Recurrence &r) : Recurrence(r) {}
     Recurrence_p(const Recurrence_p &r) : Recurrence(r) {}
-    Recurrence_p& operator=(const Recurrence_p &r)
-    {
-        Recurrence::operator=(r);
-        return *this;
-    }
+    Recurrence_p& operator=(const Recurrence_p &r) = delete;
 };
 
 class Q_DECL_HIDDEN KARecurrence::Private
@@ -130,14 +126,6 @@
     delete d;
 }
 
-KARecurrence &KARecurrence::operator=(const KARecurrence &r)
-{
-    if (&r != this) {
-        *d = *r.d;
-    }
-    return *this;
-}
-
 bool KARecurrence::operator==(const KARecurrence &r) const
 {
     return d->mRecurrence == r.d->mRecurrence