diff --git a/www/webkitgtk4/patches/patch-Source_WTF_wtf_PageBlock_h b/www/webkitgtk4/patches/patch-Source_WTF_wtf_PageBlock_h
new file mode 100644
index 00000000000..deb8e3ef247
--- /dev/null
+++ b/www/webkitgtk4/patches/patch-Source_WTF_wtf_PageBlock_h
@@ -0,0 +1,14 @@
+$OpenBSD: patch-Source_WTF_wtf_PageBlock_h,v 1.1 2020/04/25 20:04:14 jca Exp $
+
+Index: Source/WTF/wtf/PageBlock.h
+--- Source/WTF/wtf/PageBlock.h.orig
++++ Source/WTF/wtf/PageBlock.h
+@@ -51,6 +51,8 @@ namespace WTF {
+ constexpr size_t CeilingOnPageSize = 16 * KB;
+ #elif OS(WINDOWS) || CPU(MIPS) || CPU(X86) || CPU(X86_64) || CPU(ARM) || CPU(ARM64)
+ constexpr size_t CeilingOnPageSize = 4 * KB;
++#elif CPU(SPARC64)
++constexpr size_t CeilingOnPageSize = 8 * KB;
+ #elif CPU(UNKNOWN) || CPU(PPC) || CPU(PPC64) || CPU(PPC64LE)
+ constexpr size_t CeilingOnPageSize = 64 * KB;
+ #else