diff --git a/lib/systems/default.nix b/lib/systems/default.nix
index 026117cc34fd..36afdae38668 100644
--- a/lib/systems/default.nix
+++ b/lib/systems/default.nix
@@ -84,7 +84,7 @@ rec {
         else final.parsed.cpu.name;
 
       qemuArch =
-        if final.isArm then "arm"
+        if final.isAarch32 then "arm"
         else if final.isx86_64 then "x86_64"
         else if final.isx86 then "i386"
         else {
diff --git a/lib/systems/inspect.nix b/lib/systems/inspect.nix
index d1980c6dff81..01dcf0787dfa 100644
--- a/lib/systems/inspect.nix
+++ b/lib/systems/inspect.nix
@@ -55,9 +55,6 @@ rec {
 
     isEfi          = map (family: { cpu.family = family; })
                        [ "x86" "arm" "aarch64" ];
-
-    # Deprecated after 18.03
-    isArm = isAarch32;
   };
 
   matchAnyAttrs = patterns:
diff --git a/pkgs/development/web/nodejs/nodejs.nix b/pkgs/development/web/nodejs/nodejs.nix
index ea23ad06cd21..dce8479d219e 100644
--- a/pkgs/development/web/nodejs/nodejs.nix
+++ b/pkgs/development/web/nodejs/nodejs.nix
@@ -61,18 +61,18 @@ in
     configureFlags = let
       isCross = stdenv.hostPlatform != stdenv.buildPlatform;
       host = stdenv.hostPlatform.platform;
-      isArm = stdenv.hostPlatform.isArm;
+      isAarch32 = stdenv.hostPlatform.isAarch32;
     in sharedConfigureFlags ++ [
       "--without-dtrace"
     ] ++ (optionals isCross [
       "--cross-compiling"
       "--without-intl"
       "--without-snapshot"
-    ]) ++ (optionals (isCross && isArm && hasAttr "fpu" host.gcc) [
+    ]) ++ (optionals (isCross && isAarch32 && hasAttr "fpu" host.gcc) [
       "--with-arm-fpu=${host.gcc.fpu}"
-    ]) ++ (optionals (isCross && isArm && hasAttr "float-abi" host.gcc) [
+    ]) ++ (optionals (isCross && isAarch32 && hasAttr "float-abi" host.gcc) [
       "--with-arm-float-abi=${host.gcc.float-abi}"
-    ]) ++ (optionals (isCross && isArm) [
+    ]) ++ (optionals (isCross && isAarch32) [
       "--dest-cpu=arm"
     ]) ++ extraConfigFlags;
 
diff --git a/pkgs/stdenv/generic/default.nix b/pkgs/stdenv/generic/default.nix
index df2d35d541b8..77d70e84258d 100644
--- a/pkgs/stdenv/generic/default.nix
+++ b/pkgs/stdenv/generic/default.nix
@@ -137,9 +137,6 @@ let
         isi686 isx86_32 isx86_64
         is32bit is64bit
         isAarch32 isAarch64 isMips isBigEndian;
-      isArm = lib.warn
-        "`stdenv.isArm` is deprecated after 18.03. Please use `stdenv.isAarch32` instead"
-        hostPlatform.isAarch32;
 
       # The derivation's `system` is `buildPlatform.system`.
       inherit (buildPlatform) system;