diff --git a/packages/ondemand-release-latest/deb/debian/postinst b/packages/ondemand-release-latest/deb/debian/postinst
index ade94b7..ffcecac 100644
--- a/packages/ondemand-release-latest/deb/debian/postinst
+++ b/packages/ondemand-release-latest/deb/debian/postinst
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-if [ "$(uname -p)" = "ppc64le" ]; then
+if [ "$(uname -m)" = "ppc64le" ]; then
     rm -f /etc/apt/sources.list.d/nodesource.list
     rm -f /etc/apt/trusted.gpg.d/nodesource.gpg
 fi
diff --git a/packages/ondemand-release/deb/debian/postinst b/packages/ondemand-release/deb/debian/postinst
index ade94b7..ffcecac 100644
--- a/packages/ondemand-release/deb/debian/postinst
+++ b/packages/ondemand-release/deb/debian/postinst
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-if [ "$(uname -p)" = "ppc64le" ]; then
+if [ "$(uname -m)" = "ppc64le" ]; then
     rm -f /etc/apt/sources.list.d/nodesource.list
     rm -f /etc/apt/trusted.gpg.d/nodesource.gpg
 fi
diff --git a/packages/passenger/deb/debian/rules b/packages/passenger/deb/debian/rules
index db883af..926bd09 100755
--- a/packages/passenger/deb/debian/rules
+++ b/packages/passenger/deb/debian/rules
@@ -35,7 +35,7 @@ $(PREFIX)/usr/sbin/passenger-status "$$@"
 endef
 export ONDEMAND_PASSENGER_STATUS
 
-export ARCH = $(shell uname -p)
+export ARCH = $(shell uname -m)
 ifeq ($(ARCH),aarch64)
 export MFLAG = "-march=armv8-a"
 else