diff --git a/scripts/functions b/scripts/functions
index e2666262..4761c1eb 100644
--- a/scripts/functions
+++ b/scripts/functions
@@ -938,18 +938,18 @@ CT_Extract() {
     basename="$1"
     shift
 
-    if ! ext="$(CT_GetFileExtension "${basename}")"; then
-        CT_DoLog WARN "'${basename}' not found in '${CT_TARBALLS_DIR}'"
-        return 1
-    fi
-    local full_file="${CT_TARBALLS_DIR}/${basename}${ext}"
-
     # Check if already extracted
     if [ -e "${CT_SRC_DIR}/.${basename}.extracted" ]; then
         CT_DoLog DEBUG "Already extracted '${basename}'"
         return 0
     fi
 
+    if ! ext="$(CT_GetFileExtension "${basename}")"; then
+	CT_DoLog WARN "'${basename}' not found in '${CT_TARBALLS_DIR}'"
+	return 1
+    fi
+    local full_file="${CT_TARBALLS_DIR}/${basename}${ext}"
+
     # Check if previously partially extracted
     if [ -e "${CT_SRC_DIR}/.${basename}.extracting" ]; then
         CT_DoLog ERROR "The '${basename}' sources were partially extracted."