diff --git a/app-emulation/wine-proton/wine-proton-7.0.4.ebuild b/app-emulation/wine-proton/wine-proton-7.0.4.ebuild
index c1cd2ca3a3e2b..b266c555dfead 100644
--- a/app-emulation/wine-proton/wine-proton-7.0.4.ebuild
+++ b/app-emulation/wine-proton/wine-proton-7.0.4.ebuild
@@ -245,6 +245,7 @@ src_configure() {
 		: "${CROSSCFLAGS:=$(
 			filter-flags '-fstack-clash-protection' #758914
 			filter-flags '-fstack-protector*' #870136
+			filter-flags '-mfunction-return=thunk*' #878849
 			CC=${CROSSCC} test-flags-CC ${CFLAGS:--O2})}"
 		: "${CROSSLDFLAGS:=$(
 			filter-flags '-fuse-ld=*'
diff --git a/app-emulation/wine-proton/wine-proton-7.0.9999.ebuild b/app-emulation/wine-proton/wine-proton-7.0.9999.ebuild
index 4e91660724745..93b08c4d0bfd1 100644
--- a/app-emulation/wine-proton/wine-proton-7.0.9999.ebuild
+++ b/app-emulation/wine-proton/wine-proton-7.0.9999.ebuild
@@ -245,6 +245,7 @@ src_configure() {
 		: "${CROSSCFLAGS:=$(
 			filter-flags '-fstack-clash-protection' #758914
 			filter-flags '-fstack-protector*' #870136
+			filter-flags '-mfunction-return=thunk*' #878849
 			CC=${CROSSCC} test-flags-CC ${CFLAGS:--O2})}"
 		: "${CROSSLDFLAGS:=$(
 			filter-flags '-fuse-ld=*'