diff --git a/src/Magnum/Audio/Test/ContextTest.cpp b/src/Magnum/Audio/Test/ContextTest.cpp
index a2b0381b6..d5b8ef8f7 100644
--- a/src/Magnum/Audio/Test/ContextTest.cpp
+++ b/src/Magnum/Audio/Test/ContextTest.cpp
@@ -27,6 +27,7 @@
 #include <set>
 #include <sstream>
 #include <Corrade/Containers/ArrayView.h>
+#include <Corrade/Containers/StringView.h>
 #include <Corrade/TestSuite/Tester.h>
 #include <Corrade/Utility/DebugStl.h>
 
@@ -84,8 +85,13 @@ void ContextTest::extensions() {
         CORRADE_FAIL_IF(e.index() >= Implementation::ExtensionCount,
             "Index" << e.index() << "larger than" << Implementation::ExtensionCount);
 
+        /* Have to use Containers::StringView to avoid passing null char* to
+           std::cout (which crashes on Mac due to strlen being called on it)
+           because the message is actually printed sooner than the condition
+           gets tested! */
+        /** @todo clean up once fixed in Corrade */
         CORRADE_FAIL_IF(used[e.index()],
-            "Index" << e.index() << "already used by" << used[e.index()]);
+            "Index" << e.index() << "already used by" << Containers::StringView{used[e.index()]});
 
         used[e.index()] = e.string();
         CORRADE_FAIL_IF(!unique.insert(e.string()).second,
diff --git a/src/Magnum/GL/Test/ContextTest.cpp b/src/Magnum/GL/Test/ContextTest.cpp
index 4ff1b45ef..af5c0132a 100644
--- a/src/Magnum/GL/Test/ContextTest.cpp
+++ b/src/Magnum/GL/Test/ContextTest.cpp
@@ -406,8 +406,13 @@ void ContextTest::extensions() {
             CORRADE_FAIL_IF(e.index() >= GL::Implementation::ExtensionCount,
                 "Index" << e.index() << "larger than" << GL::Implementation::ExtensionCount);
 
+            /* Have to use Containers::StringView to avoid passing null char*
+               to std::cout (which crashes on Mac due to strlen being called on
+               it) because the message is actually printed sooner than the
+               condition gets tested! */
+            /** @todo clean up once fixed in Corrade */
             CORRADE_FAIL_IF(used[e.index()],
-                "Index" << e.index() << "already used by" << used[e.index()]);
+                "Index" << e.index() << "already used by" << Containers::StringView{used[e.index()]});
 
             used[e.index()] = e.string();
             CORRADE_FAIL_IF(!unique.insert(e.string()).second,