diff --git a/src/exceptions.h b/src/exceptions.h
index 6a96409cbfb6673c9cacc35d0fe57f98c1370de0..e105282fc45bc3b8f62ee3b7f0fc3608e3cf1f5d 100644
--- a/src/exceptions.h
+++ b/src/exceptions.h
@@ -11,13 +11,13 @@
 #ifdef L4N_DEBUG
 #define ERR_MSG(msg) std::string(boost::typeindex::type_id_with_cvr<decltype(*this)>().pretty_name()) + "::" + __func__ + "(): " + msg + " (" +__FILE__ + ":" + std::to_string(__LINE__) + ")"
 #else
-#define ERR_MSG(msg) std::string(boost::typeindex::type_id_with_cvr<decltype(*this)>().pretty_name()) + "::" + __func__ + "(): " + msg
+#define ERR_MSG(msg) std::string(boost::typeindex::type_id_with_cvr<decltype(*this)>().pretty_name()) + "::" + __func__ + "(): " + msg + ""
 #endif // L4N_DEBUG
 
 #define THROW_RUNTIME_ERROR(msg) throw std::runtime_error(ERR_MSG(msg))  // Errors, that can't be detected by looking at the code
 #define THROW_LOGIC_ERROR(msg) throw std::logic_error(ERR_MSG(msg))  // Errors, that can be detected by looking at the code
 #define THROW_INVALID_ARGUMENT_ERROR(msg) throw std::invalid_argument(ERR_MSG(msg))
-#define THROW_NOT_IMPLEMENTED_ERROR(msg) throw std::logic_error(ERR_MSG("This function is not implemented." + msg))
+#define THROW_NOT_IMPLEMENTED_ERROR(msg) throw std::logic_error(ERR_MSG("This function is not implemented. " + msg))
 #define THROW_OUT_OF_RANGE_ERROR(msg) throw std::out_of_range(ERR_MSG(msg))
 
 #endif //LIB4NEURO_EXCEPTIONS_H