diff --git a/tests/gtkoffscreenbox.c b/tests/gtkoffscreenbox.c
index f0a8225754..5f474ace7f 100644
--- a/tests/gtkoffscreenbox.c
+++ b/tests/gtkoffscreenbox.c
@@ -386,7 +386,7 @@ gtk_offscreen_box_add (GtkContainer *container,
   else if (!offscreen_box->child2)
     gtk_offscreen_box_add2 (offscreen_box, widget);
   else
-    g_warning ("GtkOffscreenBox cannot have more than 2 children\n");
+    g_warning ("GtkOffscreenBox cannot have more than 2 children");
 }
 
 void
diff --git a/tests/scrolling-performance.c b/tests/scrolling-performance.c
index 5b6aac2482..15fa1ef618 100644
--- a/tests/scrolling-performance.c
+++ b/tests/scrolling-performance.c
@@ -17,7 +17,7 @@ create_widget_factory_content (void)
                              "../demos/widget-factory/widget-factory.ui",
                              &error);
   if (error != NULL)
-    g_error ("Failed to create widgets: %s\n", error->message);
+    g_error ("Failed to create widgets: %s", error->message);
 
   result = GTK_WIDGET (gtk_builder_get_object (builder, "box1"));
   g_object_ref (result);
diff --git a/tests/testglarea.c b/tests/testglarea.c
index 310a244b4e..764e2311b3 100644
--- a/tests/testglarea.c
+++ b/tests/testglarea.c
@@ -66,7 +66,7 @@ create_shader (int type, const char *src)
       buffer = g_malloc (log_len + 1);
       glGetShaderInfoLog (shader, log_len, NULL, buffer);
 
-      g_warning ("Compile failure in %s shader:\n%s\n",
+      g_warning ("Compile failure in %s shader:\n%s",
                  type == GL_VERTEX_SHADER ? "vertex" : "fragment",
                  buffer);
 
@@ -158,7 +158,7 @@ init_shaders (const char *vertex_shader_code,
       buffer = g_malloc (log_len + 1);
       glGetProgramInfoLog (program, log_len, NULL, buffer);
 
-      g_warning ("Linking failure:\n%s\n", buffer);
+      g_warning ("Linking failure:\n%s", buffer);
 
       g_free (buffer);