diff --git a/dev-libs/nss/nss-3.101.2.ebuild b/dev-libs/nss/nss-3.101.2.ebuild
index a984fcb1b70ea..14db615d4523d 100644
--- a/dev-libs/nss/nss-3.101.2.ebuild
+++ b/dev-libs/nss/nss-3.101.2.ebuild
@@ -150,7 +150,7 @@ multilib_src_compile() {
 	)
 
 	# Take care of nspr settings #436216
-	local myCPPFLAGS="${CPPFLAGS} $($(tc-getPKG_CONFIG) nspr --cflags)"
+	local myCPPFLAGS="${CPPFLAGS} $($(tc-getPKG_CONFIG) nspr --cflags) -D_FILE_OFFSET_BITS=64"
 	unset NSPR_INCLUDE_DIR
 
 	export NSS_ALLOW_SSLKEYLOGFILE=1
@@ -210,7 +210,7 @@ multilib_src_compile() {
 
 	# Build the host tools first.
 	LDFLAGS="${BUILD_LDFLAGS}" \
-	XCFLAGS="${BUILD_CFLAGS}" \
+	XCFLAGS="${BUILD_CFLAGS} -D_FILE_OFFSET_BITS=64" \
 	NSPR_LIB_DIR="${T}/fakedir" \
 	emake -C coreconf \
 		CC="$(tc-getBUILD_CC)" \
@@ -220,7 +220,7 @@ multilib_src_compile() {
 	# Then build the target tools.
 	for d in . lib/dbm ; do
 		CPPFLAGS="${myCPPFLAGS}" \
-		XCFLAGS="${CFLAGS} ${CPPFLAGS}" \
+		XCFLAGS="${CFLAGS} ${CPPFLAGS} -D_FILE_OFFSET_BITS=64" \
 		NSPR_LIB_DIR="${T}/fakedir" \
 		emake "${makeargs[@]}" -C ${d} OS_TEST="$(nssarch)"
 	done
diff --git a/dev-libs/nss/nss-3.101.3.ebuild b/dev-libs/nss/nss-3.101.3.ebuild
index 166be6aa8ac72..f96bafa8b914a 100644
--- a/dev-libs/nss/nss-3.101.3.ebuild
+++ b/dev-libs/nss/nss-3.101.3.ebuild
@@ -152,7 +152,7 @@ multilib_src_compile() {
 	)
 
 	# Take care of nspr settings #436216
-	local myCPPFLAGS="${CPPFLAGS} $($(tc-getPKG_CONFIG) nspr --cflags)"
+	local myCPPFLAGS="${CPPFLAGS} $($(tc-getPKG_CONFIG) nspr --cflags) -D_FILE_OFFSET_BITS=64"
 	unset NSPR_INCLUDE_DIR
 
 	export NSS_ALLOW_SSLKEYLOGFILE=1
@@ -212,7 +212,7 @@ multilib_src_compile() {
 
 	# Build the host tools first.
 	LDFLAGS="${BUILD_LDFLAGS}" \
-	XCFLAGS="${BUILD_CFLAGS}" \
+	XCFLAGS="${BUILD_CFLAGS} -D_FILE_OFFSET_BITS=64" \
 	NSPR_LIB_DIR="${T}/fakedir" \
 	emake -C coreconf \
 		CC="$(tc-getBUILD_CC)" \
@@ -222,7 +222,7 @@ multilib_src_compile() {
 	# Then build the target tools.
 	for d in . lib/dbm ; do
 		CPPFLAGS="${myCPPFLAGS}" \
-		XCFLAGS="${CFLAGS} ${CPPFLAGS}" \
+		XCFLAGS="${CFLAGS} ${CPPFLAGS} -D_FILE_OFFSET_BITS=64" \
 		NSPR_LIB_DIR="${T}/fakedir" \
 		emake "${makeargs[@]}" -C ${d} OS_TEST="$(nssarch)"
 	done
diff --git a/dev-libs/nss/nss-3.110.ebuild b/dev-libs/nss/nss-3.110.ebuild
index f3406c97a0d5c..cde5791cc7242 100644
--- a/dev-libs/nss/nss-3.110.ebuild
+++ b/dev-libs/nss/nss-3.110.ebuild
@@ -156,7 +156,7 @@ multilib_src_compile() {
 	)
 
 	# Take care of nspr settings #436216
-	local myCPPFLAGS="${CPPFLAGS} $($(tc-getPKG_CONFIG) nspr --cflags)"
+	local myCPPFLAGS="${CPPFLAGS} $($(tc-getPKG_CONFIG) nspr --cflags) -D_FILE_OFFSET_BITS=64"
 	unset NSPR_INCLUDE_DIR
 
 	export NSS_ALLOW_SSLKEYLOGFILE=1
@@ -216,7 +216,7 @@ multilib_src_compile() {
 
 	# Build the host tools first.
 	LDFLAGS="${BUILD_LDFLAGS}" \
-	XCFLAGS="${BUILD_CFLAGS}" \
+	XCFLAGS="${BUILD_CFLAGS} -D_FILE_OFFSET_BITS=64" \
 	NSPR_LIB_DIR="${T}/fakedir" \
 	emake -C coreconf \
 		CC="$(tc-getBUILD_CC)" \
@@ -226,7 +226,7 @@ multilib_src_compile() {
 	# Then build the target tools.
 	for d in . lib/dbm ; do
 		CPPFLAGS="${myCPPFLAGS}" \
-		XCFLAGS="${CFLAGS} ${CPPFLAGS}" \
+		XCFLAGS="${CFLAGS} ${CPPFLAGS} -D_FILE_OFFSET_BITS=64" \
 		NSPR_LIB_DIR="${T}/fakedir" \
 		emake "${makeargs[@]}" -C ${d} OS_TEST="$(nssarch)"
 	done
diff --git a/dev-libs/nss/nss-3.111.ebuild b/dev-libs/nss/nss-3.111.ebuild
index f3406c97a0d5c..cde5791cc7242 100644
--- a/dev-libs/nss/nss-3.111.ebuild
+++ b/dev-libs/nss/nss-3.111.ebuild
@@ -156,7 +156,7 @@ multilib_src_compile() {
 	)
 
 	# Take care of nspr settings #436216
-	local myCPPFLAGS="${CPPFLAGS} $($(tc-getPKG_CONFIG) nspr --cflags)"
+	local myCPPFLAGS="${CPPFLAGS} $($(tc-getPKG_CONFIG) nspr --cflags) -D_FILE_OFFSET_BITS=64"
 	unset NSPR_INCLUDE_DIR
 
 	export NSS_ALLOW_SSLKEYLOGFILE=1
@@ -216,7 +216,7 @@ multilib_src_compile() {
 
 	# Build the host tools first.
 	LDFLAGS="${BUILD_LDFLAGS}" \
-	XCFLAGS="${BUILD_CFLAGS}" \
+	XCFLAGS="${BUILD_CFLAGS} -D_FILE_OFFSET_BITS=64" \
 	NSPR_LIB_DIR="${T}/fakedir" \
 	emake -C coreconf \
 		CC="$(tc-getBUILD_CC)" \
@@ -226,7 +226,7 @@ multilib_src_compile() {
 	# Then build the target tools.
 	for d in . lib/dbm ; do
 		CPPFLAGS="${myCPPFLAGS}" \
-		XCFLAGS="${CFLAGS} ${CPPFLAGS}" \
+		XCFLAGS="${CFLAGS} ${CPPFLAGS} -D_FILE_OFFSET_BITS=64" \
 		NSPR_LIB_DIR="${T}/fakedir" \
 		emake "${makeargs[@]}" -C ${d} OS_TEST="$(nssarch)"
 	done