diff --git a/hnn_core/gui/_viz_manager.py b/hnn_core/gui/_viz_manager.py
index 41eff684a..3b24161c1 100644
--- a/hnn_core/gui/_viz_manager.py
+++ b/hnn_core/gui/_viz_manager.py
@@ -302,7 +302,7 @@ def _update_ax(fig, ax, single_simulation, sim_name, plot_type, plot_config):
             max_f = plot_config['max_spectral_frequency']
             step_f = 1.0
             freqs = np.arange(min_f, max_f, step_f)
-            n_cycles = freqs / 8.
+            n_cycles = freqs / 2.
             dpls_copied[0].plot_tfr_morlet(
                 freqs,
                 n_cycles=n_cycles,
diff --git a/hnn_core/tests/test_gui.py b/hnn_core/tests/test_gui.py
index d23fbb440..b64ed6eb7 100644
--- a/hnn_core/tests/test_gui.py
+++ b/hnn_core/tests/test_gui.py
@@ -513,6 +513,8 @@ def test_gui_add_data_dependent_figure(setup_gui):
     axes_config_tabs = gui.viz_manager.axes_config_tabs
     assert len(fig_tabs.children) == 0
     assert len(axes_config_tabs.children) == 0
+    # Spectrogram needs longer time for wavelet analysis
+    gui.widget_tstop.value = 500
 
     # after each run we should have a default fig
     gui.run_button.click()
@@ -655,6 +657,8 @@ def test_gui_visualization(setup_gui):
     """Tests updating a figure creates plots with data."""
 
     gui = setup_gui
+    # Spectrogram needs longer time for wavelet analysis
+    gui.widget_tstop.value = 500
     gui.run_button.click()
 
     gui._simulate_viz_action("switch_fig_template", "[Blank] single figure")