diff --git a/c/tester.js b/c/tester.js
index c93f854..62b5822 100644
--- a/c/tester.js
+++ b/c/tester.js
@@ -81,7 +81,10 @@ async function compile (baseName, fileName, options) {
 	      let b = await exec("circom " + flags + fileName);
 	      if (options.verbose) {
             console.log(b.stdout);
-	      }
+   	    }
+        if (b.stderr) {
+            console.error(b.stderr);
+        }
     } catch (e) {
 	      assert(false,
 	             "circom compiler error \n" + e);
diff --git a/wasm/tester.js b/wasm/tester.js
index 71e14b2..0a6f4e0 100644
--- a/wasm/tester.js
+++ b/wasm/tester.js
@@ -87,8 +87,8 @@ async function compile (fileName, options) {
 	      if (options.verbose) {
             console.log(b.stdout);
 	      }
-	      if (b.stderr != '') {
-		        throw(b.stderr);
+        if (b.stderr) {
+            console.error(b.stderr);
         }
     } catch (e) {
 	      assert(false,