diff --git a/core/build.gradle b/core/build.gradle
index 690b585..d5445b3 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -1,5 +1,5 @@
 group = 'asys'
-version = '0.3-SNAPSHOT'
+version = '0.3.1-SNAPSHOT'
 
 apply plugin: 'application'
 
diff --git a/core/src/main/java/asys/core/ConfigImpl.java b/core/src/main/java/asys/core/ConfigImpl.java
index c554aed..c8c530e 100644
--- a/core/src/main/java/asys/core/ConfigImpl.java
+++ b/core/src/main/java/asys/core/ConfigImpl.java
@@ -32,7 +32,11 @@ public class ConfigImpl implements Config {
 
     @Override
     public int getInt(String key, int defaultValue) {
-        return (int) properties.getOrDefault(key, defaultValue);
+        int result = defaultValue;
+        try {
+            result = Integer.parseInt(properties.getProperty(key));
+        } catch (NumberFormatException ignore) {}
+        return result;
     }
 
     @Override
@@ -42,6 +46,10 @@ public class ConfigImpl implements Config {
 
     @Override
     public long getLong(String key, long defaultValue) {
-        return (long) properties.getOrDefault(key, defaultValue);
+        long result = defaultValue;
+        try {
+            result = Long.parseLong(properties.getProperty(key));
+        } catch (NumberFormatException ignore) {}
+        return result;
     }
 }