diff --git a/olcSoundWaveEngine.h b/olcSoundWaveEngine.h
index e482440..a71c49e 100644
--- a/olcSoundWaveEngine.h
+++ b/olcSoundWaveEngine.h
@@ -1269,7 +1269,7 @@ namespace olc::sound
 
 	bool ModularSynth::RemoveModule(Module* pModule)
 	{
-		if (std::find(m_vModules.begin(), m_vModules.end(), pModule) == std::end(m_vModules))
+		if (std::find(m_vModules.begin(), m_vModules.end(), pModule) != std::end(m_vModules))
 		{
 			m_vModules.erase(std::remove(m_vModules.begin(), m_vModules.end(), pModule), m_vModules.end());
 			return true;
@@ -1300,7 +1300,7 @@ namespace olc::sound
 	{
 		std::pair<Property*, Property*> newPatch = std::pair<Property*, Property*>(pInput, pOutput);
 
-		if (std::find(m_vPatches.begin(), m_vPatches.end(), newPatch) == std::end(m_vPatches))
+		if (std::find(m_vPatches.begin(), m_vPatches.end(), newPatch) != std::end(m_vPatches))
 		{
 			m_vPatches.erase(std::remove(m_vPatches.begin(), m_vPatches.end(), newPatch), m_vPatches.end());
 			return true;
diff --git a/source/olcSoundWaveEngine.h b/source/olcSoundWaveEngine.h
index e482440..a71c49e 100644
--- a/source/olcSoundWaveEngine.h
+++ b/source/olcSoundWaveEngine.h
@@ -1269,7 +1269,7 @@ namespace olc::sound
 
 	bool ModularSynth::RemoveModule(Module* pModule)
 	{
-		if (std::find(m_vModules.begin(), m_vModules.end(), pModule) == std::end(m_vModules))
+		if (std::find(m_vModules.begin(), m_vModules.end(), pModule) != std::end(m_vModules))
 		{
 			m_vModules.erase(std::remove(m_vModules.begin(), m_vModules.end(), pModule), m_vModules.end());
 			return true;
@@ -1300,7 +1300,7 @@ namespace olc::sound
 	{
 		std::pair<Property*, Property*> newPatch = std::pair<Property*, Property*>(pInput, pOutput);
 
-		if (std::find(m_vPatches.begin(), m_vPatches.end(), newPatch) == std::end(m_vPatches))
+		if (std::find(m_vPatches.begin(), m_vPatches.end(), newPatch) != std::end(m_vPatches))
 		{
 			m_vPatches.erase(std::remove(m_vPatches.begin(), m_vPatches.end(), newPatch), m_vPatches.end());
 			return true;
diff --git a/source/swe_synth_modular.cpp b/source/swe_synth_modular.cpp
index 3481039..6fb286a 100644
--- a/source/swe_synth_modular.cpp
+++ b/source/swe_synth_modular.cpp
@@ -38,7 +38,7 @@ namespace olc::sound::synth
 
 	bool ModularSynth::RemoveModule(Module* pModule)
 	{
-		if (std::find(m_vModules.begin(), m_vModules.end(), pModule) == std::end(m_vModules))
+		if (std::find(m_vModules.begin(), m_vModules.end(), pModule) != std::end(m_vModules))
 		{
 			m_vModules.erase(std::remove(m_vModules.begin(), m_vModules.end(), pModule), m_vModules.end());
 			return true;
@@ -69,7 +69,7 @@ namespace olc::sound::synth
 	{
 		std::pair<Property*, Property*> newPatch = std::pair<Property*, Property*>(pInput, pOutput);
 
-		if (std::find(m_vPatches.begin(), m_vPatches.end(), newPatch) == std::end(m_vPatches))
+		if (std::find(m_vPatches.begin(), m_vPatches.end(), newPatch) != std::end(m_vPatches))
 		{
 			m_vPatches.erase(std::remove(m_vPatches.begin(), m_vPatches.end(), newPatch), m_vPatches.end());
 			return true;