diff --git a/dlls/ntdll/tests/virtual.c b/dlls/ntdll/tests/virtual.c
index 31eb66c1439..683a5e7bdf6 100644
--- a/dlls/ntdll/tests/virtual.c
+++ b/dlls/ntdll/tests/virtual.c
@@ -25,6 +25,7 @@
 #include "windef.h"
 #include "winternl.h"
 #include "wine/test.h"
+#include "ddk/wdm.h"
 
 static unsigned int page_size;
 
@@ -33,6 +34,8 @@ static NTSTATUS (WINAPI *pRtlFreeUserStack)(void *);
 static BOOL (WINAPI *pIsWow64Process)(HANDLE, PBOOL);
 static const BOOL is_win64 = sizeof(void*) != sizeof(int);
 
+static SYSTEM_BASIC_INFORMATION sbi;
+
 static HANDLE create_target_process(const char *arg)
 {
     char **argv;
@@ -513,9 +516,17 @@ static void test_NtMapViewOfSection(void)
     CloseHandle(process);
 }
 
+static void test_user_shared_data(void)
+{
+    const KSHARED_USER_DATA *user_shared_data = (void *)0x7ffe0000;
+
+    ok(user_shared_data->NumberOfPhysicalPages == sbi.MmNumberOfPhysicalPages,
+            "Got number of physical pages %#x, expected %#x.\n",
+            user_shared_data->NumberOfPhysicalPages, sbi.MmNumberOfPhysicalPages);
+}
+
 START_TEST(virtual)
 {
-    SYSTEM_BASIC_INFORMATION sbi;
     HMODULE mod;
 
     int argc;
@@ -546,4 +557,5 @@ START_TEST(virtual)
     test_NtAllocateVirtualMemory();
     test_RtlCreateUserStack();
     test_NtMapViewOfSection();
+    test_user_shared_data();
 }
diff --git a/dlls/ntdll/thread.c b/dlls/ntdll/thread.c
index f993dd314c3..9c9e5f60557 100644
--- a/dlls/ntdll/thread.c
+++ b/dlls/ntdll/thread.c
@@ -222,6 +222,7 @@ static void set_process_name( int argc, char *argv[] )
  */
 TEB *thread_init(void)
 {
+    SYSTEM_BASIC_INFORMATION sbi;
     TEB *teb;
     void *addr;
     SIZE_T size;
@@ -310,6 +311,9 @@ TEB *thread_init(void)
     user_shared_data->TickCountMultiplier = 1 << 24;
     fill_cpu_info();
 
+    virtual_get_system_info( &sbi );
+    user_shared_data->NumberOfPhysicalPages = sbi.MmNumberOfPhysicalPages;
+
     return teb;
 }