diff --git a/base/applications/mspaint/canvas.cpp b/base/applications/mspaint/canvas.cpp
index 64535a86408..d36b16090bd 100644
--- a/base/applications/mspaint/canvas.cpp
+++ b/base/applications/mspaint/canvas.cpp
@@ -416,25 +416,26 @@ LRESULT CCanvasWindow::OnSize(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHa
 VOID CCanvasWindow::OnHVScroll(WPARAM wParam, INT fnBar)
 {
     SCROLLINFO si;
-    si.cbSize = sizeof(SCROLLINFO);
+    si.cbSize = sizeof(si);
     si.fMask = SIF_ALL;
     GetScrollInfo(fnBar, &si);
+
     switch (LOWORD(wParam))
     {
         case SB_THUMBTRACK:
         case SB_THUMBPOSITION:
             si.nPos = (SHORT)HIWORD(wParam);
             break;
-        case SB_LINELEFT:
-            si.nPos -= 5;
+        case SB_LINELEFT: // SB_LINEUP
+            si.nPos -= 15;
             break;
-        case SB_LINERIGHT:
-            si.nPos += 5;
+        case SB_LINERIGHT: // SB_LINEDOWN
+            si.nPos += 15;
             break;
-        case SB_PAGELEFT:
+        case SB_PAGELEFT: // SB_PAGEUP
             si.nPos -= si.nPage;
             break;
-        case SB_PAGERIGHT:
+        case SB_PAGERIGHT: // SB_PAGEDOWN
             si.nPos += si.nPage;
             break;
     }
diff --git a/base/applications/mspaint/main.cpp b/base/applications/mspaint/main.cpp
index 63e7923ec3a..6fe488d8e24 100644
--- a/base/applications/mspaint/main.cpp
+++ b/base/applications/mspaint/main.cpp
@@ -507,9 +507,9 @@ LRESULT CMainWindow::OnMouseWheel(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL&
             for (UINT i = 0; i < nCount; ++i)
             {
                 if (zDelta < 0)
-                    ::PostMessageW(canvasWindow, WM_HSCROLL, MAKEWPARAM(SB_LINEDOWN, 0), 0);
+                    ::PostMessageW(canvasWindow, WM_HSCROLL, MAKEWPARAM(SB_LINERIGHT, 0), 0);
                 else if (zDelta > 0)
-                    ::PostMessageW(canvasWindow, WM_HSCROLL, MAKEWPARAM(SB_LINEUP, 0), 0);
+                    ::PostMessageW(canvasWindow, WM_HSCROLL, MAKEWPARAM(SB_LINELEFT, 0), 0);
             }
         }
         else