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-rw-r--r--gnu/packages/astronomy.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnu/packages/astronomy.scm b/gnu/packages/astronomy.scm
index 9351c691d2..1ff6cb9892 100644
--- a/gnu/packages/astronomy.scm
+++ b/gnu/packages/astronomy.scm
@@ -428,7 +428,7 @@ made to get a better separation of core libraries and applications.
      (origin
        (method url-fetch)
        (uri (string-append
-             "http://heasarc.gsfc.nasa.gov/FTP/software/fitsio/c/"
+             "https://heasarc.gsfc.nasa.gov/FTP/software/fitsio/c/"
              "cfitsio-" version ".tar.gz"))
        (sha256
         (base32 "128qsv2q0f0g714ahlsixiikvvbwxi9bg9q9pcr5cd3f7wdkv9gb"))))