diff --git a/extra/json-c/build b/extra/json-c/build
index 7f4f480b..725ba042 100755
--- a/extra/json-c/build
+++ b/extra/json-c/build
@@ -1,7 +1,5 @@
 #!/bin/sh -e
 
-export DESTDIR="$1"
-
 cmake -B build \
     -DCMAKE_INSTALL_PREFIX=/usr \
     -DCMAKE_INSTALL_LIBDIR=lib \