diff --git a/dlls/msvcirt/msvcirt.c b/dlls/msvcirt/msvcirt.c
index 1d915faf6ea..1eefe7344ea 100644
--- a/dlls/msvcirt/msvcirt.c
+++ b/dlls/msvcirt/msvcirt.c
@@ -1580,8 +1580,32 @@ streampos __thiscall stdiobuf_seekoff(stdiobuf *this, streamoff offset, ios_seek
 DEFINE_THISCALL_WRAPPER(stdiobuf_setrwbuf, 12)
 int __thiscall stdiobuf_setrwbuf(stdiobuf *this, int read_size, int write_size)
 {
-    FIXME("(%p %d %d) stub\n", this, read_size, write_size);
-    return EOF;
+    char *reserve;
+    int buffer_size = read_size + write_size;
+
+    TRACE("(%p %d %d)\n", this, read_size, write_size);
+    if (read_size < 0 || write_size < 0)
+        return 0;
+    if (!buffer_size) {
+        this->base.unbuffered = 1;
+        return 0;
+    }
+    /* get a new buffer */
+    reserve = MSVCRT_operator_new(buffer_size);
+    if (!reserve)
+        return 0;
+    streambuf_setb(&this->base, reserve, reserve + buffer_size, 1);
+    this->base.unbuffered = 0;
+    /* set the get/put areas */
+    if (read_size > 0)
+        streambuf_setg(&this->base, reserve, reserve + read_size, reserve + read_size);
+    else
+        streambuf_setg(&this->base, NULL, NULL, NULL);
+    if (write_size > 0)
+        streambuf_setp(&this->base, reserve + read_size, reserve + buffer_size);
+    else
+        streambuf_setp(&this->base, NULL, NULL);
+    return 1;
 }
 
 /* ?stdiofile@stdiobuf@@QAEPAU_iobuf@@XZ */
diff --git a/dlls/msvcirt/tests/msvcirt.c b/dlls/msvcirt/tests/msvcirt.c
index 8bc45c1a22e..758062c4b7c 100644
--- a/dlls/msvcirt/tests/msvcirt.c
+++ b/dlls/msvcirt/tests/msvcirt.c
@@ -210,6 +210,7 @@ static int (*__thiscall p_strstreambuf_underflow)(strstreambuf*);
 static stdiobuf* (*__thiscall p_stdiobuf_file_ctor)(stdiobuf*, FILE*);
 static void (*__thiscall p_stdiobuf_dtor)(stdiobuf*);
 static int (*__thiscall p_stdiobuf_overflow)(stdiobuf*, int);
+static int (*__thiscall p_stdiobuf_setrwbuf)(stdiobuf*, int, int);
 static int (*__thiscall p_stdiobuf_sync)(stdiobuf*);
 static int (*__thiscall p_stdiobuf_underflow)(stdiobuf*);
 
@@ -374,6 +375,7 @@ static BOOL init(void)
         SET(p_stdiobuf_file_ctor, "??0stdiobuf@@QEAA@PEAU_iobuf@@@Z");
         SET(p_stdiobuf_dtor, "??1stdiobuf@@UEAA@XZ");
         SET(p_stdiobuf_overflow, "?overflow@stdiobuf@@UEAAHH@Z");
+        SET(p_stdiobuf_setrwbuf, "?setrwbuf@stdiobuf@@QEAAHHH@Z");
         SET(p_stdiobuf_sync, "?sync@stdiobuf@@UEAAHXZ");
         SET(p_stdiobuf_underflow, "?underflow@stdiobuf@@UEAAHXZ");
 
@@ -458,6 +460,7 @@ static BOOL init(void)
         SET(p_stdiobuf_file_ctor, "??0stdiobuf@@QAE@PAU_iobuf@@@Z");
         SET(p_stdiobuf_dtor, "??1stdiobuf@@UAE@XZ");
         SET(p_stdiobuf_overflow, "?overflow@stdiobuf@@UAEHH@Z");
+        SET(p_stdiobuf_setrwbuf, "?setrwbuf@stdiobuf@@QAEHHH@Z");
         SET(p_stdiobuf_sync, "?sync@stdiobuf@@UAEHXZ");
         SET(p_stdiobuf_underflow, "?underflow@stdiobuf@@UAEHXZ");
 
@@ -2016,6 +2019,35 @@ static void test_stdiobuf(void)
     ok(stb2.base.gptr == stb2.base.egptr, "wrong get pointer, expected %p got %p\n", stb2.base.egptr, stb2.base.gptr);
     stb2.base.unbuffered = 1;
 
+    /* setrwbuf */
+    ret = (int) call_func3(p_stdiobuf_setrwbuf, &stb1, 100, 60);
+    ok(ret == 1, "expected 1 got %d\n", ret);
+    ok(stb1.base.allocated == 1, "wrong allocate value, expected 1 got %d\n", stb1.base.allocated);
+    ok(stb1.base.unbuffered == 0, "wrong unbuffered value, expected 0 got %d\n", stb1.base.unbuffered);
+    ok(stb1.base.ebuf == stb1.base.base + 160, "expected %p got %p\n", stb1.base.base + 160, stb1.base.ebuf);
+    ok(stb1.base.eback == stb1.base.base, "wrong get base, expected %p got %p\n", stb1.base.base, stb1.base.eback);
+    ok(stb1.base.gptr == stb1.base.base + 100, "wrong get pointer, expected %p got %p\n", stb1.base.base + 100, stb1.base.gptr);
+    ok(stb1.base.egptr == stb1.base.base + 100, "wrong get end, expected %p got %p\n", stb1.base.base + 100, stb1.base.egptr);
+    ok(stb1.base.pbase == stb1.base.base + 100, "wrong put base, expected %p got %p\n", stb1.base.base + 100, stb1.base.pbase);
+    ok(stb1.base.pptr == stb1.base.base + 100, "wrong put pointer, expected %p got %p\n", stb1.base.base + 100, stb1.base.pptr);
+    ok(stb1.base.epptr == stb1.base.base + 160, "wrong put end, expected %p got %p\n", stb1.base.base + 160, stb1.base.epptr);
+    ret = (int) call_func3(p_stdiobuf_setrwbuf, &stb1, -1, 64);
+    ok(ret == 0 || ret == 1, "expected 0 or 1, got %d\n", ret);
+    ret = (int) call_func3(p_stdiobuf_setrwbuf, &stb1, 32, -8);
+    ok(ret == 0 || ret == 1, "expected 0 or 1, got %d\n", ret);
+    ret = (int) call_func3(p_stdiobuf_setrwbuf, &stb1, 0, 64);
+    ok(ret == 1, "expected 1 got %d\n", ret);
+    ok(stb1.base.ebuf == stb1.base.base + 64, "expected %p got %p\n", stb1.base.base + 64, stb1.base.ebuf);
+    ok(stb1.base.eback == NULL, "wrong get base, expected %p got %p\n", NULL, stb1.base.eback);
+    ok(stb1.base.gptr == NULL, "wrong get pointer, expected %p got %p\n", NULL, stb1.base.gptr);
+    ok(stb1.base.egptr == NULL, "wrong get end, expected %p got %p\n", NULL, stb1.base.egptr);
+    ok(stb1.base.pbase == stb1.base.base, "wrong put base, expected %p got %p\n", stb1.base.base, stb1.base.pbase);
+    ok(stb1.base.pptr == stb1.base.base, "wrong put pointer, expected %p got %p\n", stb1.base.base, stb1.base.pptr);
+    ok(stb1.base.epptr == stb1.base.base + 64, "wrong put end, expected %p got %p\n", stb1.base.base + 64, stb1.base.epptr);
+    ret = (int) call_func3(p_stdiobuf_setrwbuf, &stb1, 0, 0);
+    ok(ret == 0, "expected 0 got %d\n", ret);
+    ok(stb1.base.unbuffered == 1, "wrong unbuffered value, expected 1 got %d\n", stb1.base.unbuffered);
+
     call_func1(p_stdiobuf_dtor, &stb1);
     call_func1(p_stdiobuf_dtor, &stb2);
     fclose(file1);