diff --git a/test/testtokenize.cpp b/test/testtokenize.cpp
index 98398c344..20333f8e9 100644
--- a/test/testtokenize.cpp
+++ b/test/testtokenize.cpp
@@ -1126,9 +1126,18 @@ private:
     }
 
     void simplifyFloatCasts() { // float casting integers
+        // C-style casts
         ASSERT_EQUALS("a = 1.0 ;", tokenizeAndStringify("a = (float)1;"));
         ASSERT_EQUALS("a = 1.0 ;", tokenizeAndStringify("a = ((float)1);"));
         ASSERT_EQUALS("a = 291.0 ;", tokenizeAndStringify("a = ((float)0x123);"));
+
+        ASSERT_EQUALS("a = 1.0 ;", tokenizeAndStringify("a = (double)1;"));
+        ASSERT_EQUALS("a = 1.0 ;", tokenizeAndStringify("a = ((double)1);"));
+        ASSERT_EQUALS("a = 291.0 ;", tokenizeAndStringify("a = ((double)0x123);"));
+
+        ASSERT_EQUALS("a = 1.0 ;", tokenizeAndStringify("a = (long double)1;"));
+        ASSERT_EQUALS("a = 1.0 ;", tokenizeAndStringify("a = ((long double)1);"));
+        ASSERT_EQUALS("a = 291.0 ;", tokenizeAndStringify("a = ((long double)0x123);"));
     }
 
     void inlineasm() {