diff --git a/external/firebird/UnpackedTarball_firebird.mk b/external/firebird/UnpackedTarball_firebird.mk
index 79fe914467d7..c42cbd5f1201 100644
--- a/external/firebird/UnpackedTarball_firebird.mk
+++ b/external/firebird/UnpackedTarball_firebird.mk
@@ -11,11 +11,14 @@ $(eval $(call gb_UnpackedTarball_UnpackedTarball,firebird))
 
 $(eval $(call gb_UnpackedTarball_set_tarball,firebird,$(FIREBIRD_TARBALL)))
 
+$(eval $(call gb_UnpackedTarball_set_patchlevel,firebird,0))
+
 $(eval $(call gb_UnpackedTarball_add_patches,firebird,\
 	external/firebird/firebird-rpath.patch.0 \
 	external/firebird/firebird-c++11.patch.1 \
 	external/firebird/firebird-c++11replfn.patch.0 \
         external/firebird/firebird.disable-ib-util-not-found.patch.1 \
+	external/firebird/firebird-c++14.patch \
 ))
 
 ifeq ($(OS)-$(COM),WNT-MSC)
diff --git a/external/firebird/firebird-c++14.patch b/external/firebird/firebird-c++14.patch
new file mode 100644
index 000000000000..ad095bf6793e
--- /dev/null
+++ b/external/firebird/firebird-c++14.patch
@@ -0,0 +1,14 @@
+--- src/common/classes/alloc.cpp
++++ src/common/classes/alloc.cpp
+@@ -2121,3 +2121,11 @@
+ {
+ 	Firebird::MemoryPool::globalFree(mem);
+ }
++void operator delete(void* mem, size_t) throw()
++{
++	Firebird::MemoryPool::globalFree(mem);
++}
++void operator delete[](void* mem, size_t) throw()
++{
++	Firebird::MemoryPool::globalFree(mem);
++}