diff --git a/src/json.c b/src/json.c
index 6063771..d9da10d 100644
--- a/src/json.c
+++ b/src/json.c
@@ -316,7 +316,12 @@
 	    if (isnan(val->vval.v_float))
 		ga_concat(gap, (char_u *)"NaN");
 	    else if (isinf(val->vval.v_float))
-		ga_concat(gap, (char_u *)"Infinity");
+	    {
+		if (val->vval.v_float < 0.0)
+		    ga_concat(gap, (char_u *)"-Infinity");
+		else
+		    ga_concat(gap, (char_u *)"Infinity");
+	    }
 	    else
 # endif
 	    {
@@ -736,7 +741,7 @@
 		    break;
 
 		default:
-		    if (VIM_ISDIGIT(*p) || *p == '-')
+		    if (VIM_ISDIGIT(*p) || (*p == '-' && VIM_ISDIGIT(p[1])))
 		    {
 #ifdef FEAT_FLOAT
 			char_u  *sp = p;
@@ -834,6 +839,17 @@
 			retval = OK;
 			break;
 		    }
+		    if (STRNICMP((char *)p, "-Infinity", 9) == 0)
+		    {
+			reader->js_used += 9;
+			if (cur_item != NULL)
+			{
+			    cur_item->v_type = VAR_FLOAT;
+			    cur_item->vval.v_float = -INFINITY;
+			}
+			retval = OK;
+			break;
+		    }
 		    if (STRNICMP((char *)p, "Infinity", 8) == 0)
 		    {
 			reader->js_used += 8;
@@ -851,6 +867,7 @@
 		    if (
 			    (len < 5 && STRNICMP((char *)p, "false", len) == 0)
 #ifdef FEAT_FLOAT
+			    || (len < 9 && STRNICMP((char *)p, "-Infinity", len) == 0)
 			    || (len < 8 && STRNICMP((char *)p, "Infinity", len) == 0)
 			    || (len < 3 && STRNICMP((char *)p, "NaN", len) == 0)
 #endif
@@ -1072,7 +1089,7 @@
  * Return FAIL if the message has a decoding error.
  * Return MAYBE if the message is truncated, need to read more.
  * This only works reliable if the message contains an object, array or
- * string.  A number might be trucated without knowing.
+ * string.  A number might be truncated without knowing.
  * Does not advance the reader.
  */
     int
diff --git a/src/testdir/test_json.vim b/src/testdir/test_json.vim
index 396651e..e0a550c 100644
--- a/src/testdir/test_json.vim
+++ b/src/testdir/test_json.vim
@@ -29,8 +29,10 @@
 if has('float')
   let s:jsonfl = '12.34'
   let s:varfl = 12.34
-  let s:jsoninf = 'Infinity'
-  let s:varinf = 1.0 / 0.0
+  let s:jsonneginf = '-Infinity'
+  let s:jsonposinf = 'Infinity'
+  let s:varneginf = -1.0 / 0.0
+  let s:varposinf = 1.0 / 0.0
   let s:jsonnan = 'NaN'
   let s:varnan = 0.0 / 0.0
 endif
@@ -85,7 +87,8 @@
   call assert_equal(s:jsonnr, json_encode(s:varnr))
   if has('float')
     call assert_equal(s:jsonfl, json_encode(s:varfl))
-    call assert_equal(s:jsoninf, json_encode(s:varinf))
+    call assert_equal(s:jsonneginf, json_encode(s:varneginf))
+    call assert_equal(s:jsonposinf, json_encode(s:varposinf))
     call assert_equal(s:jsonnan, json_encode(s:varnan))
   endif
 
@@ -202,7 +205,8 @@
   call assert_equal(s:jsonnr, js_encode(s:varnr))
   if has('float')
     call assert_equal(s:jsonfl, js_encode(s:varfl))
-    call assert_equal(s:jsoninf, js_encode(s:varinf))
+    call assert_equal(s:jsonneginf, js_encode(s:varneginf))
+    call assert_equal(s:jsonposinf, js_encode(s:varposinf))
     call assert_equal(s:jsonnan, js_encode(s:varnan))
   endif
 
@@ -242,7 +246,8 @@
   call assert_equal(s:varnr, js_decode(s:jsonnr))
   if has('float')
     call assert_equal(s:varfl, js_decode(s:jsonfl))
-    call assert_equal(s:varinf, js_decode(s:jsoninf))
+    call assert_equal(s:varneginf, js_decode(s:jsonneginf))
+    call assert_equal(s:varposinf, js_decode(s:jsonposinf))
     call assert_true(isnan(js_decode(s:jsonnan)))
   endif
 
diff --git a/src/version.c b/src/version.c
index 7aeaa48..d7c610b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,6 +796,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    731,
+/**/
     730,
 /**/
     729,