diff --git a/src/backend/cg87.c b/src/backend/cg87.c
index 3d18eebfaa62..eda4213c191a 100644
--- a/src/backend/cg87.c
+++ b/src/backend/cg87.c
@@ -922,7 +922,7 @@ code *fixresult87(elem *e,regm_t retregs,regm_t *pretregs)
     else
     {   if (*pretregs & mPSW)
         {   if (!(retregs & mPSW))
-            {   assert(retregs & mST0);
+            {
                 c1 = genftst(c1,e,!(*pretregs & (mST0 | XMMREGS))); // FTST
             }
         }
diff --git a/test/runnable/mars1.d b/test/runnable/mars1.d
index d48eca3a97c5..e0dafee99745 100644
--- a/test/runnable/mars1.d
+++ b/test/runnable/mars1.d
@@ -1125,6 +1125,18 @@ void test9449()
     if (arr[0].g != 4.0) assert(0);
 }
 
+////////////////////////////////////////////////////////////////////////
+// https://issues.dlang.org/show_bug.cgi?id=12057
+
+bool prop12057(real x) { return false; }
+double f12057(real) { return double.init; }
+void test12057()
+{
+    real fc = f12057(real.init);
+    if (fc == 0 || fc.prop12057) {}
+}
+
+
 ////////////////////////////////////////////////////////////////////////
  
 int main()
@@ -1159,6 +1171,7 @@ int main()
     test7565();
     test12833();
     test9449();
+    test12057();
     printf("Success\n");
     return 0;
 }