diff --git a/libraries/mbed/api/Stream.h b/libraries/mbed/api/Stream.h
index a57053e67c..e92ec8155c 100644
--- a/libraries/mbed/api/Stream.h
+++ b/libraries/mbed/api/Stream.h
@@ -37,6 +37,8 @@ public:
     char *gets(char *s, int size);
     int printf(const char* format, ...);
     int scanf(const char* format, ...);
+    int vprintf(const char* format, va_list args);
+    int vscanf(const char* format, va_list args);
 
     operator std::FILE*() {return _file;}
 
diff --git a/libraries/mbed/common/Stream.cpp b/libraries/mbed/common/Stream.cpp
index 6d3a33526f..ec5b7cf3c2 100644
--- a/libraries/mbed/common/Stream.cpp
+++ b/libraries/mbed/common/Stream.cpp
@@ -108,4 +108,16 @@ int Stream::scanf(const char* format, ...) {
     return r;
 }
 
+int Stream::vprintf(const char* format, va_list args) {
+    fflush(_file);
+    int r = vfprintf(_file, format, args);
+    return r;
+}
+
+int Stream::vscanf(const char* format, va_list args) {
+    fflush(_file);
+    int r = vfscanf(_file, format, args);
+    return r;
+}
+
 } // namespace mbed