diff --git a/gnu/packages/astronomy.scm b/gnu/packages/astronomy.scm
index 0e7f380d9d..53bac8e5c4 100644
--- a/gnu/packages/astronomy.scm
+++ b/gnu/packages/astronomy.scm
@@ -935,7 +935,7 @@ (define-public gpredict
        ("goocanvas" ,goocanvas)
        ("gtk+" ,gtk+)))
     (arguments
-     `(#:configure-flags '("CFLAGS=-fcommon")
+     `(#:configure-flags '("CFLAGS=-O2 -g -fcommon")
        #:phases
        (modify-phases %standard-phases
          (add-after 'unpack 'fix-tests