diff --git a/libs/ofxHTTP/src/OAuth10Credentials.cpp b/libs/ofxHTTP/src/OAuth10Credentials.cpp
index 5f28219..43db9d0 100644
--- a/libs/ofxHTTP/src/OAuth10Credentials.cpp
+++ b/libs/ofxHTTP/src/OAuth10Credentials.cpp
@@ -94,12 +94,17 @@ OAuth10Credentials OAuth10Credentials::fromJSON(const ofJson& json)
         const auto& key = iter.key();
         const auto& value = iter.value();
 
-        if (key == "consumerKey") credentials._consumerKey = value;
-        else if (key == "consumerSecret" || key == "consumer_secret") credentials._consumerSecret = value;
-        else if (key == "accessToken" || key == "access_token") credentials._accessToken = value;
-        else if (key == "accessTokenSecret" || key == "access_token_secret") credentials._accessTokenSecret = value;
-        else if (key == "owner") credentials._owner = value;
-        else if (key == "ownerId" || key == "owner_id" ) credentials._ownerId = value;
+        if (key == "consumerKey") credentials._consumerKey = value.get<std::string>();
+        else if (key == "consumerSecret" || key == "consumer_secret")
+            credentials._consumerSecret = value.get<std::string>();
+        else if (key == "accessToken" || key == "access_token")
+            credentials._accessToken = value.get<std::string>();
+        else if (key == "accessTokenSecret" || key == "access_token_secret")
+            credentials._accessTokenSecret = value.get<std::string>();
+        else if (key == "owner")
+            credentials._owner = value.get<std::string>();
+        else if (key == "ownerId" || key == "owner_id")
+            credentials._ownerId = value.get<std::string>();
         else ofLogWarning("Credentials::fromJSON") << "Unknown key: " << key << std::endl << value.dump(4);
         ++iter;
     }