diff --git a/dlls/jscript/jsutils.c b/dlls/jscript/jsutils.c
index e7100ba0d71..edfebcfea42 100644
--- a/dlls/jscript/jsutils.c
+++ b/dlls/jscript/jsutils.c
@@ -303,6 +303,9 @@ HRESULT variant_to_jsval(VARIANT *var, jsval_t *r)
     case VT_UI4:
         *r = jsval_number(V_UI4(var));
         return S_OK;
+    case VT_R4:
+        *r = jsval_number(V_R4(var));
+        return S_OK;
     case VT_UNKNOWN:
         if(V_UNKNOWN(var)) {
             IDispatch *disp;
diff --git a/dlls/jscript/tests/run.c b/dlls/jscript/tests/run.c
index ff6edceace5..1d42c54f493 100644
--- a/dlls/jscript/tests/run.c
+++ b/dlls/jscript/tests/run.c
@@ -1315,7 +1315,7 @@ static HRESULT WINAPI Global_InvokeEx(IDispatchEx *iface, DISPID id, LCID lcid,
         return S_OK;
 
     case DISPID_GLOBAL_TESTARGTYPES: {
-        VARIANT args[6], v;
+        VARIANT args[7], v;
         DISPPARAMS dp = {args, NULL, sizeof(args)/sizeof(*args), 0};
         HRESULT hres;
 
@@ -1355,6 +1355,8 @@ static HRESULT WINAPI Global_InvokeEx(IDispatchEx *iface, DISPID id, LCID lcid,
         V_UI4(args+4) = 0xffffffff;
         V_VT(args+5) = VT_BYREF|VT_VARIANT;
         V_VARIANTREF(args+5) = &v;
+        V_VT(args+6) = VT_R4;
+        V_R4(args+6) = 0.5;
         V_VT(&v) = VT_I4;
         V_I4(&v) = 2;
         hres = IDispatch_Invoke(V_DISPATCH(pdp->rgvarg), DISPID_VALUE, &IID_NULL, 0, DISPATCH_METHOD, &dp, NULL, NULL, NULL);
@@ -2644,7 +2646,8 @@ static BOOL run_tests(void)
     CHECK_CALLED(global_propargput_i);
 
     SET_EXPECT(global_testargtypes_i);
-    parse_script_a("testArgTypes(dispUnk, intProp(), intProp, getShort(), shortProp, function(i4ref,ui4,nullunk,d,i,s) {"
+    parse_script_a("testArgTypes(dispUnk, intProp(), intProp, getShort(), shortProp,"
+                   "function(r4,i4ref,ui4,nullunk,d,i,s) {"
                    "    ok(getVT(i) === 'VT_I4', 'getVT(i) = ' + getVT(i));"
                    "    ok(getVT(s) === 'VT_I4', 'getVT(s) = ' + getVT(s));"
                    "    ok(getVT(d) === 'VT_DISPATCH', 'getVT(d) = ' + getVT(d));"
@@ -2654,6 +2657,8 @@ static BOOL run_tests(void)
                    "    ok(ui4 > 0, 'ui4 = ' + ui4);"
                    "    ok(getVT(i4ref) === 'VT_I4', 'getVT(i4ref) = ' + getVT(i4ref));"
                    "    ok(i4ref === 2, 'i4ref = ' + i4ref);"
+                   "    ok(r4 === 0.5, 'r4 = ' + r4);"
+                   "    ok(getVT(r4) === 'VT_R8', 'getVT(r4) = ' + getVT(r4));"
                    "});");
     CHECK_CALLED(global_testargtypes_i);