diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
index 93b8ee2ad4..3d3d20d609 100644
--- a/gnu/packages/maths.scm
+++ b/gnu/packages/maths.scm
@@ -3858,6 +3858,9 @@ (define-public openblas
                   ;; On aarch64 force the generic 'armv8-a' target
                   ((string-prefix? "aarch64" system)
                    '("TARGET=ARMV8"))
+                  ;; Failed to detect CPU.
+                  ((string-prefix? "armhf" system)
+                   '("TARGET=ARMV7"))
                   (else '()))))
        ;; no configure script
        #:phases