diff --git a/jerry-core/ecma/base/ecma-globals.h b/jerry-core/ecma/base/ecma-globals.h
index 6eceae0b6..e84f84210 100644
--- a/jerry-core/ecma/base/ecma-globals.h
+++ b/jerry-core/ecma/base/ecma-globals.h
@@ -619,7 +619,7 @@ typedef double ecma_number_t;
 /**
  * Maximum number of significant digits that ecma-number can store
  */
-#define ECMA_NUMBER_MAX_DIGITS  (18)
+#define ECMA_NUMBER_MAX_DIGITS  (19)
 
 /**
  * Width of sign field
diff --git a/jerry-core/ecma/base/ecma-helpers-conversion.cpp b/jerry-core/ecma/base/ecma-helpers-conversion.cpp
index 34405ca12..ad6fa56e3 100644
--- a/jerry-core/ecma/base/ecma-helpers-conversion.cpp
+++ b/jerry-core/ecma/base/ecma-helpers-conversion.cpp
@@ -626,7 +626,7 @@ ecma_utf8_string_to_number (const lit_utf8_byte_t *str_p, /**< utf-8 string */
   }
 
 #if CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT64
-  int32_t binary_exponent = 1;
+  int32_t binary_exponent = 33;
 
   /*
    * 128-bit mantissa storage
@@ -635,9 +635,9 @@ ecma_utf8_string_to_number (const lit_utf8_byte_t *str_p, /**< utf-8 string */
    */
   ECMA_NUMBER_CONVERSION_128BIT_INTEGER (fraction_uint128);
   ECMA_NUMBER_CONVERSION_128BIT_INTEGER_INIT (fraction_uint128,
+                                             0ull,
                                              fraction_uint64 >> 32u,
                                              (uint32_t) fraction_uint64,
-                                             0ull,
                                              0ull);
 
   /* Normalizing mantissa */
diff --git a/tests/jerry/arithmetics-bignums.js b/tests/jerry/arithmetics-bignums.js
index 295846ea1..29f4c099f 100644
--- a/tests/jerry/arithmetics-bignums.js
+++ b/tests/jerry/arithmetics-bignums.js
@@ -24,3 +24,5 @@ big++;
 assert(big == 2147483649); // overflow on 32bit numbers
 
 assert ((1152921504606846900).toString() === "1152921504606847000")
+
+assert (1.797693134862315808e+308 === Infinity);