diff --git a/gnu/packages/audio.scm b/gnu/packages/audio.scm
index 2f25668f26..e602b002f2 100644
--- a/gnu/packages/audio.scm
+++ b/gnu/packages/audio.scm
@@ -3405,7 +3405,7 @@ (define-public gsm
              ;; mediastreamer.
              (substitute* "Makefile"
                (("^CCFLAGS.*" all)
-                (string-append all "CCFLAGS += -fPIC")))
+                (string-append all "CCFLAGS += -fPIC\n")))
              #t))
          (add-before 'install 'pre-install
            (lambda _