diff --git a/View/acoustic_inversion_tab.py b/View/acoustic_inversion_tab.py
index 2880f2e..70728c0 100644
--- a/View/acoustic_inversion_tab.py
+++ b/View/acoustic_inversion_tab.py
@@ -492,7 +492,7 @@ class AcousticInversionTab(QWidget):
             msgBox.setWindowTitle("Alpha computation error")
             msgBox.setIconPixmap(
                 QPixmap(
-                    self.path_icon + "no_approved.png"
+                    self._path_icon("no_approved.png")
                 ).scaledToHeight(32, Qt.SmoothTransformation)
             )
             msgBox.setText("Sediment sound attenuation is negative !")
@@ -503,7 +503,7 @@ class AcousticInversionTab(QWidget):
             msgBox.setWindowTitle("Alpha computation error")
             msgBox.setIconPixmap(
                 QPixmap(
-                    self.path_icon + "no_approved.png"
+                    self._path_icon("no_approved.png")
                 ).scaledToHeight(32, Qt.SmoothTransformation)
             )
             msgBox.setText("Sediment sound attenuation is infinite !")