diff --git a/datatypes.h b/datatypes.h
index a66c8c7d8..787738e9b 100644
--- a/datatypes.h
+++ b/datatypes.h
@@ -121,7 +121,7 @@ struct _fft_settings {
 	gfloat fft_pwr_off;
 	struct _fft_alg_data fft_alg_data;
 	struct marker_type *markers;
-	struct marker_type *markers_copy;
+	struct marker_type **markers_copy;
 	GMutex *marker_lock;
 	enum marker_types *marker_type;
 };
@@ -136,7 +136,7 @@ struct _cross_correlation_settings {
 	fftw_complex *signal_b;
 	fftw_complex *xcorr_data;
 	struct marker_type *markers;
-	struct marker_type *markers_copy;
+	struct marker_type **markers_copy;
 	GMutex *marker_lock;
 	enum marker_types *marker_type;
 };
diff --git a/osc.c b/osc.c
index cf54278e8..afe682a98 100644
--- a/osc.c
+++ b/osc.c
@@ -325,10 +325,10 @@ static void do_fft(Transform *tr)
 
 			}
 		}
-		if (settings->markers_copy) {
-			memcpy(settings->markers_copy, settings->markers,
+		if (*settings->markers_copy) {
+			memcpy(*settings->markers_copy, settings->markers,
 				sizeof(struct marker_type) * MAX_MARKERS);
-			settings->markers_copy = NULL;
+			*settings->markers_copy = NULL;
 			g_mutex_unlock(settings->marker_lock);
 		}
 	}
@@ -521,20 +521,20 @@ void cross_correlation_transform_function(Transform *tr, gboolean init_transform
 	if (!tr->has_the_marker)
 		return;
 
-	if (MAX_MARKERS && marker_type != MARKER_OFF)
+	if (MAX_MARKERS && marker_type != MARKER_OFF) {
 		for (j = 0; j <= MAX_MARKERS && markers[j].active; j++)
 			if (marker_type == MARKER_PEAK) {
 				markers[j].x = (gfloat)X[maxx[j]];
 				markers[j].y = (gfloat)out_data[maxx[j]];
 				markers[j].bin = maxx[j];
 			}
-
-	if (settings->markers_copy) {
-			memcpy(settings->markers_copy, settings->markers,
+		if (*settings->markers_copy) {
+			memcpy(*settings->markers_copy, settings->markers,
 				sizeof(struct marker_type) * MAX_MARKERS);
-			settings->markers_copy = NULL;
+			*settings->markers_copy = NULL;
 			g_mutex_unlock(settings->marker_lock);
 		}
+	}
 }
 
 void fft_transform_function(Transform *tr, gboolean init_transform)
diff --git a/oscplot.c b/oscplot.c
index c32229a3d..63e28afb9 100644
--- a/oscplot.c
+++ b/oscplot.c
@@ -871,12 +871,12 @@ static void add_markers(OscPlot *plot, Transform *transform)
 	if (priv->active_transform_type == FFT_TRANSFORM ||
 		priv->active_transform_type == COMPLEX_FFT_TRANSFORM) {
 		FFT_SETTINGS(transform)->markers = priv->markers;
-		FFT_SETTINGS(transform)->markers_copy = priv->markers_copy;
+		FFT_SETTINGS(transform)->markers_copy = &priv->markers_copy;
 		FFT_SETTINGS(transform)->marker_type = &priv->marker_type;
 		FFT_SETTINGS(transform)->marker_lock = &priv->g_marker_copy_lock;
 	} else if (priv->active_transform_type == CROSS_CORRELATION_TRANSFORM) {
 		XCORR_SETTINGS(transform)->markers = priv->markers;
-		XCORR_SETTINGS(transform)->markers_copy = priv->markers_copy;
+		XCORR_SETTINGS(transform)->markers_copy = &priv->markers_copy;
 		XCORR_SETTINGS(transform)->marker_type = &priv->marker_type;
 		XCORR_SETTINGS(transform)->marker_lock = &priv->g_marker_copy_lock;
 	}