diff --git a/dlls/d3d8/device.c b/dlls/d3d8/device.c
index 847adad08d4..1424342a1ae 100644
--- a/dlls/d3d8/device.c
+++ b/dlls/d3d8/device.c
@@ -2457,7 +2457,7 @@ static HRESULT WINAPI d3d8_device_GetVertexShaderConstant(IDirect3DDevice8 *ifac
     }
 
     wined3d_mutex_lock();
-    hr = wined3d_device_get_vs_consts_f(device->wined3d_device, start_register, data, count);
+    hr = wined3d_device_get_vs_consts_f(device->wined3d_device, start_register, count, data);
     wined3d_mutex_unlock();
 
     return hr;
diff --git a/dlls/d3d9/device.c b/dlls/d3d9/device.c
index 53486bc463f..be5e9f79ff6 100644
--- a/dlls/d3d9/device.c
+++ b/dlls/d3d9/device.c
@@ -2836,7 +2836,8 @@ static HRESULT WINAPI d3d9_device_GetVertexShaderConstantF(IDirect3DDevice9Ex *i
     }
 
     wined3d_mutex_lock();
-    hr = wined3d_device_get_vs_consts_f(device->wined3d_device, reg_idx, data, count);
+    hr = wined3d_device_get_vs_consts_f(device->wined3d_device,
+            reg_idx, count, (struct wined3d_vec4 *)data);
     wined3d_mutex_unlock();
 
     return hr;
diff --git a/dlls/wined3d/device.c b/dlls/wined3d/device.c
index 7afdff8a03e..76b7eaf6a8c 100644
--- a/dlls/wined3d/device.c
+++ b/dlls/wined3d/device.c
@@ -2494,18 +2494,18 @@ HRESULT CDECL wined3d_device_set_vs_consts_f(struct wined3d_device *device,
 }
 
 HRESULT CDECL wined3d_device_get_vs_consts_f(const struct wined3d_device *device,
-        UINT start_register, float *constants, UINT vector4f_count)
+        unsigned int start_idx, unsigned int count, struct wined3d_vec4 *constants)
 {
     const struct wined3d_d3d_info *d3d_info = &device->adapter->d3d_info;
-    int count = min(vector4f_count, d3d_info->limits.vs_uniform_count - start_register);
 
-    TRACE("device %p, start_register %u, constants %p, vector4f_count %u.\n",
-            device, start_register, constants, vector4f_count);
+    TRACE("device %p, start_idx %u, count %u, constants %p.\n",
+            device, start_idx, count, constants);
 
-    if (!constants || count < 0)
+    if (!constants || start_idx >= d3d_info->limits.vs_uniform_count
+            || count > d3d_info->limits.vs_uniform_count - start_idx)
         return WINED3DERR_INVALIDCALL;
 
-    memcpy(constants, &device->state.vs_consts_f[start_register], count * sizeof(float) * 4);
+    memcpy(constants, &device->state.vs_consts_f[start_idx], count * sizeof(*constants));
 
     return WINED3D_OK;
 }
diff --git a/dlls/wined3d/wined3d.spec b/dlls/wined3d/wined3d.spec
index 26a0c073bd1..e23bb0326bb 100644
--- a/dlls/wined3d/wined3d.spec
+++ b/dlls/wined3d/wined3d.spec
@@ -94,7 +94,7 @@
 @ cdecl wined3d_device_get_viewport(ptr ptr)
 @ cdecl wined3d_device_get_vs_cb(ptr long)
 @ cdecl wined3d_device_get_vs_consts_b(ptr long ptr long)
-@ cdecl wined3d_device_get_vs_consts_f(ptr long ptr long)
+@ cdecl wined3d_device_get_vs_consts_f(ptr long long ptr)
 @ cdecl wined3d_device_get_vs_consts_i(ptr long ptr long)
 @ cdecl wined3d_device_get_vs_resource_view(ptr long)
 @ cdecl wined3d_device_get_vs_sampler(ptr long)
diff --git a/include/wine/wined3d.h b/include/wine/wined3d.h
index d789470aabf..d0151c3756d 100644
--- a/include/wine/wined3d.h
+++ b/include/wine/wined3d.h
@@ -2153,7 +2153,7 @@ struct wined3d_buffer * __cdecl wined3d_device_get_vs_cb(const struct wined3d_de
 HRESULT __cdecl wined3d_device_get_vs_consts_b(const struct wined3d_device *device,
         UINT start_register, BOOL *constants, UINT bool_count);
 HRESULT __cdecl wined3d_device_get_vs_consts_f(const struct wined3d_device *device,
-        UINT start_register, float *constants, UINT vector4f_count);
+        unsigned int start_idx, unsigned int count, struct wined3d_vec4 *constants);
 HRESULT __cdecl wined3d_device_get_vs_consts_i(const struct wined3d_device *device,
         UINT start_register, int *constants, UINT vector4i_count);
 struct wined3d_shader_resource_view * __cdecl wined3d_device_get_vs_resource_view(const struct wined3d_device *device,