diff --git a/sonarr.sh b/sonarr.sh
index 242b85f..e40eaa7 100755
--- a/sonarr.sh
+++ b/sonarr.sh
@@ -45,14 +45,26 @@ api_get_query() {
     curl -s -G -H "$AUTH_HEADER" "$API/$path" "$@"
 }
 
+# Payload goes through a temp file (curl -d @file), not as a command-line
+# argument - a large library (e.g. Jeopardy's 1269-file import payload) can
+# exceed the OS argument-length limit and fail with "Argument list too long"
+# if passed directly via -d "$2".
 api_post() {
+    local payload_file
+    payload_file=$(mktemp)
+    printf '%s' "$2" > "$payload_file"
     curl -s -X POST -H "$AUTH_HEADER" -H "Content-Type: application/json" \
-        -d "$2" "$API/$1"
+        -d "@$payload_file" "$API/$1"
+    rm -f "$payload_file"
 }
 
 api_put() {
+    local payload_file
+    payload_file=$(mktemp)
+    printf '%s' "$2" > "$payload_file"
     curl -s -X PUT -H "$AUTH_HEADER" -H "Content-Type: application/json" \
-        -d "$2" "$API/$1"
+        -d "@$payload_file" "$API/$1"
+    rm -f "$payload_file"
 }
 
 # --------------------------------------------------------------------------