diff --git a/modules/core/src/dxt.cpp b/modules/core/src/dxt.cpp
index 79cb31ceed..90eb392f58 100644
--- a/modules/core/src/dxt.cpp
+++ b/modules/core/src/dxt.cpp
@@ -1070,11 +1070,12 @@ RealDFT( const T* src, T* dst, int n, int nf, int* factors, const int* itab,
         }
     }
 
-    if( complex_output && (n & 1) == 0 )
+    if (complex_output && ((n & 1) == 0 || n == 1))
     {
         dst[-1] = dst[0];
         dst[0] = 0;
-        dst[n] = 0;
+        if (n > 1)
+            dst[n] = 0;
     }
 }