diff --git a/tests/FilesT.cpp b/tests/FilesT.cpp
index 07d12c03..6fc1e773 100644
--- a/tests/FilesT.cpp
+++ b/tests/FilesT.cpp
@@ -517,7 +517,7 @@ TEST_CASE("[Files] Off modes")
     REQUIRE( synth.getNumActiveVoices() == 3 );
     REQUIRE( numPlayingVoices(synth) == 1 );
     AudioBuffer<float> buffer { 2, 256 };
-    for (unsigned i = 0; i < 10; ++i) // Not enough for the "normal" voice to die
+    for (unsigned i = 0; i < 20; ++i) // Not enough for the "normal" voice to die
         synth.renderBlock(buffer);
     REQUIRE( synth.getNumActiveVoices() == 2 );
     REQUIRE( fastVoice->isFree() );
diff --git a/tests/SynthT.cpp b/tests/SynthT.cpp
index cd309176..3bf2cc64 100644
--- a/tests/SynthT.cpp
+++ b/tests/SynthT.cpp
@@ -31,7 +31,7 @@ TEST_CASE("[Synth] Play and check active voices")
     synth.noteOn(0, 36, 89);
     REQUIRE(synth.getNumActiveVoices() == 2);
     // Render for a while
-    for (int i = 0; i < 200; ++i)
+    for (int i = 0; i < 300; ++i)
         synth.renderBlock(buffer);
     REQUIRE(synth.getNumActiveVoices() == 0);
 }