diff --git a/gnu/packages/machine-learning.scm b/gnu/packages/machine-learning.scm
index b663b4ffcb..7fd0a26d0d 100644
--- a/gnu/packages/machine-learning.scm
+++ b/gnu/packages/machine-learning.scm
@@ -267,6 +267,9 @@ (define-public randomjungle
     (native-inputs
      `(("gfortran" ,gfortran)
        ("gfortran:lib" ,gfortran "lib")))
+    ;; Non-portable assembly instructions are used so building fails on
+    ;; platforms other than x86_64 or i686.
+    (supported-systems '("x86_64-linux" "i686-linux"))
     (home-page "http://www.imbs-luebeck.de/imbs/de/node/227/")
     (synopsis "Implementation of the Random Forests machine learning method")
     (description