diff --git a/release/Makefile.azure b/release/Makefile.azure
index de95a944f9c7..32e91833b766 100644
--- a/release/Makefile.azure
+++ b/release/Makefile.azure
@@ -39,7 +39,7 @@ azure-check-depends:
 .   endif
 	env ASSUME_ALWAYS_YES=yes pkg install -y www/npm
 .  else
-	make -C ${PORTSDIR}/www/npm BATCH=1 all install clean
+	env UNAME_r=${UNAME_r} make -C ${PORTSDIR}/www/npm BATCH=1 all install clean
 .  endif
 . endif
 	npm install -g azure-cli
diff --git a/release/Makefile.ec2 b/release/Makefile.ec2
index 63552494db95..171de4ee2fa0 100644
--- a/release/Makefile.ec2
+++ b/release/Makefile.ec2
@@ -33,7 +33,7 @@ CW_EC2_PORTINSTALL=
 
 cw-ec2-portinstall:
 .if exists(${PORTSDIR}/net/bsdec2-image-upload/Makefile)
-	env - PATH=$$PATH make -C ${PORTSDIR}/net/bsdec2-image-upload BATCH=1 all install clean
+	env - UNAME_r=${UNAME_r} PATH=$$PATH make -C ${PORTSDIR}/net/bsdec2-image-upload BATCH=1 all install clean
 .else
 . if !exists(/usr/local/sbin/pkg-static)
 	env ASSUME_ALWAYS_YES=yes pkg bootstrap -y
diff --git a/release/Makefile.gce b/release/Makefile.gce
index 106804de61e3..fac6918eab34 100644
--- a/release/Makefile.gce
+++ b/release/Makefile.gce
@@ -48,7 +48,7 @@ gce-check-depends:
 .  endif
 	env ASSUME_ALWAYS_YES=yes pkg install -y net/google-cloud-sdk
 . else
-	make -C ${PORTSDIR}/net/google-cloud-sdk BATCH=1 all install clean
+	env UNAME_r=${UNAME_r} make -C ${PORTSDIR}/net/google-cloud-sdk BATCH=1 all install clean
 . endif
 .endif
 
diff --git a/release/Makefile.vagrant b/release/Makefile.vagrant
index 4abcaa891ed3..d49eedacb6c9 100644
--- a/release/Makefile.vagrant
+++ b/release/Makefile.vagrant
@@ -58,7 +58,7 @@ vagrant-check-depends:
 .  endif
 	env ASSUME_ALWAYS_YES=yes pkg install -y curl
 . else
-	make -C ${PORTSDIR}/ftp/curl BATCH=1 all install clean
+	env UNAME_r=${UNAME_r} make -C ${PORTSDIR}/ftp/curl BATCH=1 all install clean
 . endif
 .endif