diff --git a/pkgs/os-specific/linux/nmon/default.nix b/pkgs/os-specific/linux/nmon/default.nix
index 7ec84443cfe8..18adf9c69057 100644
--- a/pkgs/os-specific/linux/nmon/default.nix
+++ b/pkgs/os-specific/linux/nmon/default.nix
@@ -11,7 +11,13 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ ncurses ];
   dontUnpack = true;
-  buildPhase = "cc -o nmon ${src} -g -O2 -D JFS -D GETUSER -Wall -D LARGEMEM -lncurses -lm -g -D X86";
+  buildPhase = "${stdenv.cc.targetPrefix}cc -o nmon ${src} -g -O2 -D JFS -D GETUSER -Wall -D LARGEMEM -lncurses -lm -g -D ${
+    with stdenv.targetPlatform;
+    if isx86_32 || isx86_64 then "X86"
+    else if isAarch32 || isAarch64 then "ARM"
+    else if isPower then "POWER"
+    else "UNKNOWN"
+  }";
   installPhase = ''
     mkdir -p $out/bin
     cp nmon $out/bin