diff --git a/freqtrade/optimize/__init__.py b/freqtrade/optimize/__init__.py
index ac5cda4d0..7bdaef852 100644
--- a/freqtrade/optimize/__init__.py
+++ b/freqtrade/optimize/__init__.py
@@ -11,13 +11,13 @@ from freqtrade import misc, constants, OperationalException
 from freqtrade.exchange import Exchange
 from freqtrade.arguments import TimeRange
 
+logger = logging.getLogger(__name__)
+
 import importlib
 ujson_found = importlib.util.find_spec("ujson")
 if ujson_found is not None:
     import ujson
-
-logger = logging.getLogger(__name__)
-
+    logger.debug('Loaded UltraJson ujson in optimize.py')
 
 def trim_tickerlist(tickerlist: List[Dict], timerange: TimeRange) -> List[Dict]:
     if not tickerlist:
@@ -68,12 +68,15 @@ def load_tickerdata_file(
     if os.path.isfile(gzipfile):
         logger.debug('Loading ticker data from file %s', gzipfile)
         with gzip.open(gzipfile) as tickerdata:
-            pairdata = json.load(tickerdata)
+            if ujson_found is not None:
+                pairdata = ujson.load(tickerdata, precise_float=True)
+            else:
+                pairdata = json.load(tickerdata)
     elif os.path.isfile(file):
         logger.debug('Loading ticker data from file %s', file)
         with open(file) as tickerdata:
             if ujson_found is not None:
-                pairdata = ujson.load(tickerdata)
+                pairdata = ujson.load(tickerdata, precise_float=True)
             else:
                 pairdata = json.load(tickerdata)
     else:
@@ -171,7 +174,10 @@ def load_cached_data_for_updating(filename: str,
     # read the cached file
     if os.path.isfile(filename):
         with open(filename, "rt") as file:
-            data = json.load(file)
+            if ujson_found is not None:
+                data = ujson.load(file, precise_float=True)
+            else:
+                data = json.load(file)
             # remove the last item, because we are not sure if it is correct
             # it could be fetched when the candle was incompleted
             if data: