diff --git a/Mk/Uses/firebird.mk b/Mk/Uses/firebird.mk
index 63123bf5f503..a06dee9a7a3a 100644
--- a/Mk/Uses/firebird.mk
+++ b/Mk/Uses/firebird.mk
@@ -14,7 +14,7 @@ FIREBIRD_VER=	${FIREBIRD_DEFAULT}
 
 # When adding a version, please keep the comment in
 # Mk/bsd.default-versions.mk in sync.
-VALID_FIREBIRD_VER=        2.5 3.0 4.0
+VALID_FIREBIRD_VER=        3.0 4.0
 
 .  if ! ${VALID_FIREBIRD_VER:M${FIREBIRD_DEFAULT}}
 IGNORE=		Invalid Firebird default version ${FIREBIRD_DEFAULT}; valid versions are ${VALID_FIREBIRD_VER}
diff --git a/Mk/bsd.default-versions.mk b/Mk/bsd.default-versions.mk
index 03c358d3ea3f..8d8cdf71b807 100644
--- a/Mk/bsd.default-versions.mk
+++ b/Mk/bsd.default-versions.mk
@@ -40,8 +40,8 @@ BDB_DEFAULT?=		5
 COROSYNC_DEFAULT?=	2
 # Possible_values: full canna nox devel_full devel_nox
 #EMACS_DEFAULT?=	let the flavor be the default if not explicitly set
-# Possible values: 2.5, 3.0, 4.0
-FIREBIRD_DEFAULT?=	2.5
+# Possible values: 3.0, 4.0
+FIREBIRD_DEFAULT?=	3.0
 # Possible values: gfortran
 FORTRAN_DEFAULT?=	gfortran
 # Possible values: 3.2.2