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-rw-r--r--gnu/packages/maths.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
index fe1dfdcb67..45d699e39c 100644
--- a/gnu/packages/maths.scm
+++ b/gnu/packages/maths.scm
@@ -1567,7 +1567,7 @@ online as well as original implementations of various other algorithms.")
(source (origin
(method url-fetch)
(uri (string-append
- "http://www.coin-or.org/download/source/Ipopt/Ipopt-"
+ "https://www.coin-or.org/download/source/Ipopt/Ipopt-"
version".tgz"))
(sha256
(base32