diff --git a/src/silx/gui/plot/backends/BackendBase.py b/src/silx/gui/plot/backends/BackendBase.py
index 8d70286a8a..35aa429af7 100755
--- a/src/silx/gui/plot/backends/BackendBase.py
+++ b/src/silx/gui/plot/backends/BackendBase.py
@@ -216,6 +216,7 @@ def addMarker(
         text: str | None,
         color: str,
         symbol: str | None,
+        symbolsize: float,
         linestyle: str | tuple[float, tuple[float, ...] | None],
         linewidth: float,
         constraint: Callable[[float, float], tuple[float, float]] | None,
diff --git a/src/silx/gui/plot/backends/BackendMatplotlib.py b/src/silx/gui/plot/backends/BackendMatplotlib.py
index c6784050ef..7ca5533544 100755
--- a/src/silx/gui/plot/backends/BackendMatplotlib.py
+++ b/src/silx/gui/plot/backends/BackendMatplotlib.py
@@ -942,6 +942,7 @@ def addMarker(
         text,
         color,
         symbol,
+        symbolsize: float,
         linestyle,
         linewidth,
         constraint,
@@ -968,7 +969,7 @@ def addMarker(
         marker = self._getMarkerFromSymbol(symbol)
         if x is not None and y is not None:
             line = ax.plot(
-                x, y, linestyle=" ", color=color, marker=marker, markersize=10.0
+                x, y, linestyle=" ", color=color, marker=marker, markersize=symbolsize
             )[-1]
 
             if text is not None:
diff --git a/src/silx/gui/plot/backends/BackendOpenGL.py b/src/silx/gui/plot/backends/BackendOpenGL.py
index 4ee509d0ce..928424191f 100755
--- a/src/silx/gui/plot/backends/BackendOpenGL.py
+++ b/src/silx/gui/plot/backends/BackendOpenGL.py
@@ -110,6 +110,7 @@ def __init__(
         text,
         color,
         symbol,
+        symbolsize,
         linewidth,
         dashoffset,
         dashpattern,
@@ -136,6 +137,7 @@ def __init__(
                 "color": colors.rgba(color),
                 "constraint": constraint if isConstraint else None,
                 "symbol": symbol,
+                "symbolsize": symbolsize,
                 "linewidth": linewidth,
                 "dashoffset": dashoffset,
                 "dashpattern": dashpattern,
@@ -737,7 +739,7 @@ def _renderItems(self, overlay=False):
                         (pixelPos[1],),
                         marker=item["symbol"],
                         color=color,
-                        size=11,
+                        size=item["symbolsize"],
                     )
                     context.matrix = self.matScreenProj
                     marker.render(context)
@@ -1184,6 +1186,7 @@ def addMarker(
         text,
         color,
         symbol,
+        symbolsize: float,
         linestyle,
         linewidth,
         constraint,
@@ -1201,6 +1204,7 @@ def addMarker(
             text,
             color,
             symbol,
+            symbolsize,
             linewidth,
             dashoffset,
             dashpattern,
diff --git a/src/silx/gui/plot/items/marker.py b/src/silx/gui/plot/items/marker.py
index b3da451f5a..6e5467a314 100755
--- a/src/silx/gui/plot/items/marker.py
+++ b/src/silx/gui/plot/items/marker.py
@@ -78,11 +78,19 @@ def __init__(self):
 
         self._x = None
         self._y = None
+        self._symbol_size = 10.0
         self._bgColor: colors.RGBAColorType | None = None
         self._constraint = self._defaultConstraint
         self.__isBeingDragged = False
 
-    def _addRendererCall(self, backend, symbol=None, linestyle="-", linewidth=1):
+    def _addRendererCall(
+        self,
+        backend,
+        symbol=None,
+        symbolsize=10.,
+        linestyle="-",
+        linewidth=1,
+    ):
         """Perform the update of the backend renderer"""
         return backend.addMarker(
             x=self.getXPosition(),
@@ -90,6 +98,7 @@ def _addRendererCall(self, backend, symbol=None, linestyle="-", linewidth=1):
             text=self.getText(),
             color=self.getColor(),
             symbol=symbol,
+            symbolsize=symbolsize,
             linestyle=linestyle,
             linewidth=linewidth,
             constraint=self.getConstraint(),
@@ -246,6 +255,9 @@ class Marker(MarkerBase, SymbolMixIn):
     _DEFAULT_SYMBOL = "+"
     """Default symbol of the marker"""
 
+    _DEFAULT_SYMBOL_SIZE = 10.0
+    """Default size of marker's symbol"""
+
     def __init__(self):
         MarkerBase.__init__(self)
         SymbolMixIn.__init__(self)
@@ -254,7 +266,11 @@ def __init__(self):
         self._y = 0.0
 
     def _addBackendRenderer(self, backend):
-        return self._addRendererCall(backend, symbol=self.getSymbol())
+        return self._addRendererCall(
+            backend,
+            symbol=self.getSymbol(),
+            symbolsize=self.getSymbolSize(),
+        )
 
     def _setConstraint(self, constraint):
         """Set the constraint function of the marker drag.