diff --git a/emacs/guix-base.el b/emacs/guix-base.el
index 1248ecbce5a1ec1d6b23152432424745e5531f05..75d19cbfe06b8cb1bda97853fbd0b0fe312adfc0 100644
--- a/emacs/guix-base.el
+++ b/emacs/guix-base.el
@@ -44,7 +44,7 @@
 
 (defun guix-package-name-specification (name version &optional output)
   "Return Guix package specification by its NAME, VERSION and OUTPUT."
-  (concat name "-" version
+  (concat name "@" version
           (when output (concat ":" output))))
 
 
diff --git a/emacs/guix-main.scm b/emacs/guix-main.scm
index 11b9c773b991fd13805db639a7ad1260f3fcd9fd..34da6ac6b651b21abc8da464d4327d650c76ef5f 100644
--- a/emacs/guix-main.scm
+++ b/emacs/guix-main.scm
@@ -86,13 +86,13 @@ (define (output+error thunk)
 (define (full-name->name+version spec)
   "Given package specification SPEC with or without output,
 return two values: name and version.  For example, for SPEC
-\"foo-0.9.1b:lib\", return \"foo\" and \"0.9.1b\"."
+\"foo@0.9.1b:lib\", return \"foo\" and \"0.9.1b\"."
   (let-values (((name version output)
                 (package-specification->name+version+output spec)))
     (values name version)))
 
 (define (name+version->full-name name version)
-  (string-append name "-" version))
+  (string-append name "@" version))
 
 (define* (make-package-specification name #:optional version output)
   (let ((full-name (if version
@@ -263,7 +263,8 @@ (define (package-inputs-names inputs)
   "Return a list of full names of the packages from package INPUTS."
   (filter-map (match-lambda
                ((_ (? package? package))
-                (package-full-name package))
+                (make-package-specification (package-name package)
+                                            (package-version package)))
                ((_ (? package? package) output)
                 (make-package-specification (package-name package)
                                             (package-version package)
diff --git a/emacs/guix-ui-package.el b/emacs/guix-ui-package.el
index 8635c73e9bff634189ce3d26ac61f9ff210feefc..9d81c6126e2dbfde65e0b61568a920a824c8e84b 100644
--- a/emacs/guix-ui-package.el
+++ b/emacs/guix-ui-package.el
@@ -946,7 +946,7 @@ See `guix-find-location' for the meaning of DIRECTORY."
 (defun guix-packages-by-name (name &optional profile)
   "Display Guix packages with NAME.
 NAME is a string with name specification.  It may optionally contain
-a version number.  Examples: \"guile\", \"guile-2.0.11\".
+a version number.  Examples: \"guile\", \"guile@2.0.11\".
 
 If PROFILE is nil, use `guix-current-profile'.
 Interactively with prefix, prompt for PROFILE."