diff --git a/pkgs/build-support/cc-wrapper/cc-wrapper.sh b/pkgs/build-support/cc-wrapper/cc-wrapper.sh
index f1f56cf5cec..d2cdbf6ce0c 100644
--- a/pkgs/build-support/cc-wrapper/cc-wrapper.sh
+++ b/pkgs/build-support/cc-wrapper/cc-wrapper.sh
@@ -1,5 +1,5 @@
 #! @shell@
-set -eu -o pipefail
+set -eu -o pipefail +o posix
 shopt -s nullglob
 
 if (( "${NIX_DEBUG:-0}" >= 7 )); then
diff --git a/pkgs/build-support/cc-wrapper/gnat-wrapper.sh b/pkgs/build-support/cc-wrapper/gnat-wrapper.sh
index b15f1e461e5..7a0eb28be63 100644
--- a/pkgs/build-support/cc-wrapper/gnat-wrapper.sh
+++ b/pkgs/build-support/cc-wrapper/gnat-wrapper.sh
@@ -1,5 +1,5 @@
 #! @shell@
-set -eu -o pipefail
+set -eu -o pipefail +o posix
 shopt -s nullglob
 
 if (( "${NIX_DEBUG:-0}" >= 7 )); then
diff --git a/pkgs/build-support/cc-wrapper/gnatlink-wrapper.sh b/pkgs/build-support/cc-wrapper/gnatlink-wrapper.sh
index 88e644dc54d..0944d74e431 100644
--- a/pkgs/build-support/cc-wrapper/gnatlink-wrapper.sh
+++ b/pkgs/build-support/cc-wrapper/gnatlink-wrapper.sh
@@ -1,5 +1,5 @@
 #! @shell@
-set -eu -o pipefail
+set -eu -o pipefail +o posix
 shopt -s nullglob
 
 if (( "${NIX_DEBUG:-0}" >= 7 )); then
diff --git a/pkgs/build-support/cc-wrapper/ld-wrapper.sh b/pkgs/build-support/cc-wrapper/ld-wrapper.sh
index 232e1245af0..ef618f9a86d 100644
--- a/pkgs/build-support/cc-wrapper/ld-wrapper.sh
+++ b/pkgs/build-support/cc-wrapper/ld-wrapper.sh
@@ -1,5 +1,5 @@
 #! @shell@
-set -eu -o pipefail
+set -eu -o pipefail +o posix
 shopt -s nullglob
 
 if (( "${NIX_DEBUG:-0}" >= 7 )); then