diff --git a/misc/valentina/files/patch-src_libs_vgeometry_vcubicbezierpath.cpp b/misc/valentina/files/patch-src_libs_vgeometry_vcubicbezierpath.cpp
new file mode 100644
index 000000000000..bb3aba57e28a
--- /dev/null
+++ b/misc/valentina/files/patch-src_libs_vgeometry_vcubicbezierpath.cpp
@@ -0,0 +1,11 @@
+--- src/libs/vgeometry/vcubicbezierpath.cpp.orig	2026-06-12 19:33:33 UTC
++++ src/libs/vgeometry/vcubicbezierpath.cpp
+@@ -312,7 +312,7 @@ auto VCubicBezierPath::CountSubSpl(vsizetype size) -> 
+         return 0;
+     }
+ #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+-    return qFloor(qAbs((size - 4) / 3.0L + 1));
++    return qFloor(qAbs((static_cast<long double>(size) - 4) / 3.0L + 1));
+ #else
+     return qFloor(qAbs((size - 4) / 3.0 + 1));
+ #endif