diff --git a/FourmiCrawler/sources/PubChem.py b/FourmiCrawler/sources/PubChem.py
index 0768612..0bc8b8c 100644
--- a/FourmiCrawler/sources/PubChem.py
+++ b/FourmiCrawler/sources/PubChem.py
@@ -16,9 +16,9 @@ class PubChem(Source):
     """
 
     #PubChem has its data on compound name, properties and their values on different html pages, so different URLs used
-    website = 'https://.*\\.ncbi\\.nlm\\.nih\\.gov/.*'
-    website_www = 'https://www.ncbi.nlm.nih.gov/*'
-    website_pubchem = 'https://pubchem.ncbi.nlm.nih.gov/.*'
+    website = 'http://.*\\.ncbi\\.nlm\\.nih\\.gov/.*'
+    website_www = 'http://www.ncbi.nlm.nih.gov/*'
+    website_pubchem = 'http://pubchem.ncbi.nlm.nih.gov/.*'
     search = 'pccompound?term=%s'
     data_url = 'toc/summary_toc.cgi?tocid=27&cid=%s'