diff --git a/reactos/lib/rtl/sprintf.c b/reactos/lib/rtl/sprintf.c
index c6d651af98d..42aca6c3511 100644
--- a/reactos/lib/rtl/sprintf.c
+++ b/reactos/lib/rtl/sprintf.c
@@ -451,7 +451,10 @@ int __cdecl _vsnprintf(char *buf, size_t cnt, const char *fmt, va_list args)
 
 		/* get the conversion qualifier */
 		qualifier = -1;
-		if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt == 'w') {
+        if (*fmt == 'l' && *(fmt+1) == 'l') {
+            qualifier = 'I';
+            fmt += 2;
+		} else if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt == 'w') {
 			qualifier = *fmt;
 			++fmt;
 		} else if (*fmt == 'I' && *(fmt+1) == '6' && *(fmt+2) == '4') {
diff --git a/reactos/lib/rtl/swprintf.c b/reactos/lib/rtl/swprintf.c
index 8ac75cad4e9..3d6488b92b6 100644
--- a/reactos/lib/rtl/swprintf.c
+++ b/reactos/lib/rtl/swprintf.c
@@ -449,7 +449,10 @@ int __cdecl _vsnwprintf(wchar_t *buf, size_t cnt, const wchar_t *fmt, va_list ar
 
 		/* get the conversion qualifier */
 		qualifier = -1;
-		if (*fmt == L'h' || *fmt == L'l' || *fmt == L'L' || *fmt == L'w') {
+        if (*fmt == L'l' && *(fmt+1) == L'l') {
+            qualifier = L'I';
+            fmt += 2;
+		} else if (*fmt == L'h' || *fmt == L'l' || *fmt == L'L' || *fmt == L'w') {
 			qualifier = *fmt;
 			++fmt;
 		} else if (*fmt == L'I' && *(fmt+1) == L'6' && *(fmt+2) == L'4') {