diff --git a/.changeset/twenty-houses-sell.md b/.changeset/twenty-houses-sell.md
new file mode 100644
index 0000000..e522625
--- /dev/null
+++ b/.changeset/twenty-houses-sell.md
@@ -0,0 +1,5 @@
+---
+'steiger': minor
+---
+
+Make the JSON reporter output to stderr to be consistent with the pretty reporter
diff --git a/packages/steiger/src/cli.ts b/packages/steiger/src/cli.ts
index d407875..0751978 100755
--- a/packages/steiger/src/cli.ts
+++ b/packages/steiger/src/cli.ts
@@ -102,7 +102,7 @@ try {
 
 const printDiagnostics = (diagnostics: Array<Diagnostic>) => {
   if (consoleArgs.reporter === 'json') {
-    console.log(JSON.stringify(diagnostics, null, 2))
+    console.error(JSON.stringify(diagnostics, null, 2))
   } else {
     reportPretty(diagnostics, process.cwd())
   }