diff --git a/src/lib/dhcpsrv/cfg_option.h b/src/lib/dhcpsrv/cfg_option.h
index 884e679c14..6d6f089f71 100644
--- a/src/lib/dhcpsrv/cfg_option.h
+++ b/src/lib/dhcpsrv/cfg_option.h
@@ -561,6 +561,7 @@ class CfgOption : public isc::data::CfgToElement {
     ///
     /// @return Pointer to the container holding returned options. This
     /// container is empty if no options have been found.
+    __attribute__ ((visibility ("default")))
     OptionContainerPtr getAll(const std::string& option_space) const;
 
     /// @brief Returns vendor options for the specified vendor id.
@@ -569,6 +570,7 @@ class CfgOption : public isc::data::CfgToElement {
     ///
     /// @return Pointer to the container holding returned options. This
     /// container is empty if no options have been found.
+    __attribute__ ((visibility ("default")))
     OptionContainerPtr getAll(const uint32_t vendor_id) const;
 
     /// @brief Returns all non-vendor or vendor options for the specified