diff --git a/SConstruct b/SConstruct
index 2f5edad3e..b3d383796 100644
--- a/SConstruct
+++ b/SConstruct
@@ -3563,6 +3563,8 @@ class DXXArchive(DXXCommon):
 'misc/hmp.cpp',
 'misc/ignorecase.cpp',
 'misc/strutil.cpp',
+'misc/vgrphys.cpp',
+'misc/vgwphys.cpp',
 'texmap/ntmap.cpp',
 'texmap/scanline.cpp'
 ]
diff --git a/common/misc/vg-wrap-physfs.h b/common/misc/vg-wrap-physfs.h
new file mode 100644
index 000000000..55b07faf5
--- /dev/null
+++ b/common/misc/vg-wrap-physfs.h
@@ -0,0 +1,26 @@
+#include <physfs.h>
+#include "dxxsconf.h"
+
+#ifndef DXX_ENABLE_wrap_PHYSFS_write
+#define DXX_ENABLE_wrap_PHYSFS_write	DXX_HAVE_POISON_VALGRIND
+#endif
+
+#if DXX_ENABLE_wrap_PHYSFS_write
+extern "C" {
+	DXX_VG_DECLARE_EXTERN_C(PHYSFS_write);
+	DXX_VG_DECLARE_EXTERN_C(PHYSFS_writeSBE16);
+	DXX_VG_DECLARE_EXTERN_C(PHYSFS_writeSBE32);
+	DXX_VG_DECLARE_EXTERN_C(PHYSFS_writeSLE16);
+	DXX_VG_DECLARE_EXTERN_C(PHYSFS_writeSLE32);
+	DXX_VG_DECLARE_EXTERN_C(PHYSFS_writeULE16);
+	DXX_VG_DECLARE_EXTERN_C(PHYSFS_writeULE32);
+}
+
+DXX_VG_DEFINE_WRITE(PHYSFS_writeSBE16, PHYSFS_sint16);
+DXX_VG_DEFINE_WRITE(PHYSFS_writeSBE32, PHYSFS_sint32);
+DXX_VG_DEFINE_WRITE(PHYSFS_writeSLE16, PHYSFS_sint16);
+DXX_VG_DEFINE_WRITE(PHYSFS_writeSLE32, PHYSFS_sint32);
+DXX_VG_DEFINE_WRITE(PHYSFS_writeULE16, PHYSFS_uint16);
+DXX_VG_DEFINE_WRITE(PHYSFS_writeULE32, PHYSFS_uint32);
+
+#endif
diff --git a/common/misc/vgrphys.cpp b/common/misc/vgrphys.cpp
new file mode 100644
index 000000000..beac5d177
--- /dev/null
+++ b/common/misc/vgrphys.cpp
@@ -0,0 +1,16 @@
+#define DXX_VG_DECLARE_EXTERN_C(F)	\
+	decltype(F) __real_##F
+
+#define DXX_VG_DEFINE_WRITE(F,V)	\
+	int __real_##F(PHYSFS_File *const file, V val) {	\
+		return F(file, val);	\
+	}
+
+#include "vg-wrap-physfs.h"
+
+#if DXX_ENABLE_wrap_PHYSFS_write
+PHYSFS_sint64 __real_PHYSFS_write(PHYSFS_File *const handle, const void *const buffer, const PHYSFS_uint32 objSize, const PHYSFS_uint32 objCount)
+{
+	return PHYSFS_write(handle, buffer, objSize, objCount);
+}
+#endif
diff --git a/common/misc/vgwphys.cpp b/common/misc/vgwphys.cpp
new file mode 100644
index 000000000..43887a2b8
--- /dev/null
+++ b/common/misc/vgwphys.cpp
@@ -0,0 +1,35 @@
+#define DXX_VG_DECLARE_EXTERN_C(F)	\
+	decltype(F) __real_##F, __wrap_##F
+
+#define DXX_VG_DEFINE_WRITE(F,V)	\
+	int __wrap_##F(PHYSFS_File *const file, V val) {	\
+		dxx_vg_wrap_check_value(__builtin_return_address(0), &val, sizeof(val));	\
+		return __real_##F(file, val);	\
+	}
+
+static void dxx_vg_wrap_check_value(const void *, const void *, unsigned long);
+
+#include "vg-wrap-physfs.h"
+
+#if DXX_ENABLE_wrap_PHYSFS_write
+#include "console.h"
+#include "dxxerror.h"
+#include "poison.h"
+
+static void dxx_vg_wrap_check_value(const void *const ret, const void *const val, const unsigned long vlen)
+{
+	if (const auto o = VALGRIND_CHECK_MEM_IS_DEFINED(val, vlen))
+		con_printf(CON_URGENT, DXX_STRINGIZE_FL(__FILE__, __LINE__, "BUG: ret=%p VALGRIND_CHECK_MEM_IS_DEFINED(%p, %lu)=%p (offset=%p)"), ret, val, vlen, reinterpret_cast<void *>(o), reinterpret_cast<void *>(o - reinterpret_cast<uintptr_t>(val)));
+}
+
+PHYSFS_sint64 __wrap_PHYSFS_write(PHYSFS_File *const handle, const void *const buffer, const PHYSFS_uint32 objSize, const PHYSFS_uint32 objCount)
+{
+	const uint8_t *p = reinterpret_cast<const uint8_t *>(buffer);
+	for (PHYSFS_uint32 i = 0; i != objCount; ++i, p += objSize)
+	{
+		if (const auto o = VALGRIND_CHECK_MEM_IS_DEFINED(p, objSize))
+			con_printf(CON_URGENT, DXX_STRINGIZE_FL(__FILE__, __LINE__, "BUG: ret=%p buffer=%p i=%.3u/%.3u VALGRIND_CHECK_MEM_IS_DEFINED(%p, %u)=%p (offset=%p)"), __builtin_return_address(0), buffer, i, objCount, p, objSize, reinterpret_cast<void *>(o), reinterpret_cast<void *>(o - reinterpret_cast<uintptr_t>(p)));
+	}
+	return __real_PHYSFS_write(handle, buffer, objSize, objCount);
+}
+#endif