diff --git a/dlls/jscript/math.c b/dlls/jscript/math.c
index 8f3cb03689..f0274419e2 100644
--- a/dlls/jscript/math.c
+++ b/dlls/jscript/math.c
@@ -181,8 +181,22 @@ static HRESULT Math_acos(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *
 static HRESULT Math_asin(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 {
-    FIXME("\n");
-    return E_NOTIMPL;
+    VARIANT v;
+    HRESULT hres;
+
+    TRACE("\n");
+
+    if(!arg_cnt(dp)) {
+        if(retv) num_set_nan(retv);
+        return S_OK;
+    }
+
+    hres = to_number(dispex->ctx, get_arg(dp, 0), ei, &v);
+    if(FAILED(hres))
+        return hres;
+
+    if(retv) num_set_val(retv, asin(num_val(&v)));
+    return S_OK;
 }
 
 static HRESULT Math_atan(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *dp,
diff --git a/dlls/jscript/tests/api.js b/dlls/jscript/tests/api.js
index 9976bb290b..09d85d1dbe 100644
--- a/dlls/jscript/tests/api.js
+++ b/dlls/jscript/tests/api.js
@@ -659,6 +659,39 @@ ok(isNaN(tmp), "Math.acos(Infinity) is not NaN");
 tmp = Math.acos(-Infinity);
 ok(isNaN(tmp), "Math.acos(-Infinity) is not NaN");
 
+tmp = Math.asin(0);
+ok(Math.floor(tmp*100) === 0, "Math.asin(0) = " + tmp);
+
+tmp = Math.asin(1);
+ok(Math.floor(tmp*100) === 157, "Math.asin(1) = " + tmp);
+
+tmp = Math.asin(-1);
+ok(Math.floor(tmp*100) === -158, "Math.asin(-1) = " + tmp);
+
+tmp = Math.asin(Math.PI/4, 2);
+ok(Math.floor(tmp*100) === 90, "Math.asin(Math.PI/4, 2) = " + tmp);
+
+tmp = Math.asin(true);
+ok(Math.floor(tmp*100) === 157, "Math.asin(true) = " + tmp);
+
+tmp = Math.asin(false);
+ok(Math.floor(tmp*100) === 0, "Math.asin(false) = " + tmp);
+
+tmp = Math.asin(1.1);
+ok(isNaN(tmp), "Math.asin(1.1) is not NaN");
+
+tmp = Math.asin();
+ok(isNaN(tmp), "Math.asin() is not NaN");
+
+tmp = Math.asin(NaN);
+ok(isNaN(tmp), "Math.asin(NaN) is not NaN");
+
+tmp = Math.asin(Infinity);
+ok(isNaN(tmp), "Math.asin(Infinity) is not NaN");
+
+tmp = Math.asin(-Infinity);
+ok(isNaN(tmp), "Math.asin(-Infinity) is not NaN");
+
 var func = function  (a) {
         var a = 1;
         if(a) return;