diff --git a/dlls/ddraw/tests/ddraw1.c b/dlls/ddraw/tests/ddraw1.c
index d3a296ce376..fa550f4aef4 100644
--- a/dlls/ddraw/tests/ddraw1.c
+++ b/dlls/ddraw/tests/ddraw1.c
@@ -1898,6 +1898,14 @@ static void test_window_style(void)
     GetClientRect(window, &r);
     todo_wine ok(!EqualRect(&r, &fullscreen_rect), "Client rect and window rect are equal.\n");
 
+    hr = IDirectDraw_SetCooperativeLevel(ddraw, window, DDSCL_NORMAL);
+    ok(SUCCEEDED(hr), "SetCooperativeLevel failed, hr %#x.\n", hr);
+
+    tmp = GetWindowLongA(window, GWL_STYLE);
+    todo_wine ok(tmp == style, "Expected window style %#x, got %#x.\n", style, tmp);
+    tmp = GetWindowLongA(window, GWL_EXSTYLE);
+    todo_wine ok(tmp == exstyle, "Expected window extended style %#x, got %#x.\n", exstyle, tmp);
+
     ref = IDirectDraw_Release(ddraw);
     ok(ref == 0, "The ddraw object was not properly freed: refcount %u.\n", ref);
 
diff --git a/dlls/ddraw/tests/ddraw2.c b/dlls/ddraw/tests/ddraw2.c
index a52cb785295..8bb33fc5942 100644
--- a/dlls/ddraw/tests/ddraw2.c
+++ b/dlls/ddraw/tests/ddraw2.c
@@ -2105,6 +2105,14 @@ static void test_window_style(void)
     GetClientRect(window, &r);
     todo_wine ok(!EqualRect(&r, &fullscreen_rect), "Client rect and window rect are equal.\n");
 
+    hr = IDirectDraw2_SetCooperativeLevel(ddraw, window, DDSCL_NORMAL);
+    ok(SUCCEEDED(hr), "SetCooperativeLevel failed, hr %#x.\n", hr);
+
+    tmp = GetWindowLongA(window, GWL_STYLE);
+    todo_wine ok(tmp == style, "Expected window style %#x, got %#x.\n", style, tmp);
+    tmp = GetWindowLongA(window, GWL_EXSTYLE);
+    todo_wine ok(tmp == exstyle, "Expected window extended style %#x, got %#x.\n", exstyle, tmp);
+
     ref = IDirectDraw2_Release(ddraw);
     ok(ref == 0, "The ddraw object was not properly freed: refcount %u.\n", ref);
 
diff --git a/dlls/ddraw/tests/ddraw4.c b/dlls/ddraw/tests/ddraw4.c
index 55b6c01c4b0..742bd3f3c30 100644
--- a/dlls/ddraw/tests/ddraw4.c
+++ b/dlls/ddraw/tests/ddraw4.c
@@ -2220,6 +2220,14 @@ static void test_window_style(void)
     GetClientRect(window, &r);
     todo_wine ok(!EqualRect(&r, &fullscreen_rect), "Client rect and window rect are equal.\n");
 
+    hr = IDirectDraw4_SetCooperativeLevel(ddraw, window, DDSCL_NORMAL);
+    ok(SUCCEEDED(hr), "SetCooperativeLevel failed, hr %#x.\n", hr);
+
+    tmp = GetWindowLongA(window, GWL_STYLE);
+    todo_wine ok(tmp == style, "Expected window style %#x, got %#x.\n", style, tmp);
+    tmp = GetWindowLongA(window, GWL_EXSTYLE);
+    todo_wine ok(tmp == exstyle, "Expected window extended style %#x, got %#x.\n", exstyle, tmp);
+
     ref = IDirectDraw4_Release(ddraw);
     ok(ref == 0, "The ddraw object was not properly freed: refcount %u.\n", ref);
 
diff --git a/dlls/ddraw/tests/ddraw7.c b/dlls/ddraw/tests/ddraw7.c
index 027e03a40cb..3d8c70d2fce 100644
--- a/dlls/ddraw/tests/ddraw7.c
+++ b/dlls/ddraw/tests/ddraw7.c
@@ -1952,6 +1952,14 @@ static void test_window_style(void)
     GetClientRect(window, &r);
     todo_wine ok(!EqualRect(&r, &fullscreen_rect), "Client rect and window rect are equal.\n");
 
+    hr = IDirectDraw7_SetCooperativeLevel(ddraw, window, DDSCL_NORMAL);
+    ok(SUCCEEDED(hr), "SetCooperativeLevel failed, hr %#x.\n", hr);
+
+    tmp = GetWindowLongA(window, GWL_STYLE);
+    todo_wine ok(tmp == style, "Expected window style %#x, got %#x.\n", style, tmp);
+    tmp = GetWindowLongA(window, GWL_EXSTYLE);
+    todo_wine ok(tmp == exstyle, "Expected window extended style %#x, got %#x.\n", exstyle, tmp);
+
     ref = IDirectDraw7_Release(ddraw);
     ok(ref == 0, "The ddraw object was not properly freed: refcount %u.\n", ref);