diff --git a/astronaut/astronaut b/astronaut/astronaut
index 200f96b..2aca272 100755
--- a/astronaut/astronaut
+++ b/astronaut/astronaut
@@ -54,19 +54,19 @@ while getopts "h?s:b:i:p:r:IcCdvo:" opt; do
             exit 0
             ;;
         s)
-            dir_source="$OPTARG"
+            dir_source="$(realpath "$OPTARG")"
             ;;
         b)
-            dir_build="$OPTARG"
+            dir_build="$(realpath "$OPTARG")"
             ;;
         i)
-            dir_install="$OPTARG"
+            dir_install="$(realpath "$OPTARG")"
             ;;
         p)
-            dir_prefix="$OPTARG"
+            dir_prefix="$(realpath "$OPTARG")"
             ;;
         r)
-            dir_sysroot="$OPTARG"
+            dir_sysroot="$(realpath "$OPTARG")"
             ;;
         I)
             _nuke_dir_install=true