diff --git a/Makefile b/Makefile
index 585fc74..0670b6e 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ CXXFLAGS_release := -O3 -flto
 CFLAGS_release := -O3 -flto
 LDFLAGS_release := -O3 -flto
 TARGET_ARCH := -march=native
-CXXFLAGS += -std=c++17
+CXXFLAGS += -std=c++20
 
 LIBS := -lstdc++ -lm -lGL -lX11 -lXext -lXinerama -lasound -ldl -lfreetype -lpthread -lrt 
 LDFLAGS += $(TARGET_ARCH) $(LIBDIR) -L/usr/X11R6/lib/
diff --git a/Source/GraphComponent.cpp b/Source/GraphComponent.cpp
index fe1c00c..9f2f316 100644
--- a/Source/GraphComponent.cpp
+++ b/Source/GraphComponent.cpp
@@ -136,7 +136,7 @@ void GraphComponent::receiverStatusChanged(ReceiverInterface *pReceiver)
 		for (i=0; i < w.size(); i++)
 		{
 			m_pCurves[j].m_pPointArray[i].x = (float)i;
-			m_pCurves[j].m_pPointArray[i].y = abs(w(i));
+			m_pCurves[j].m_pPointArray[i].y = abs(w[i]);
 
 			if (m_pCurves[j].m_pPointArray[i].y < minY)
 			{
@@ -157,7 +157,7 @@ void GraphComponent::receiverStatusChanged(ReceiverInterface *pReceiver)
 		for (i=0; i < w.size(); i++)
 		{
 			m_pCurves[j].m_pPointArray[i].x = (float)i;
-			m_pCurves[j].m_pPointArray[i].y = abs(w(i));
+			m_pCurves[j].m_pPointArray[i].y = abs(w[i]);
 
 			if (m_pCurves[j].m_pPointArray[i].y < minY)
 			{
diff --git a/mpsk.code-workspace b/mpsk.code-workspace
index a58ce83..531aeb8 100644
--- a/mpsk.code-workspace
+++ b/mpsk.code-workspace
@@ -104,7 +104,9 @@
 			"hash_map": "cpp",
 			"armadillo": "cpp",
 			"matrixfunctions": "cpp",
-			"float.h": "c"
+			"float.h": "c",
+			"fir2.h": "c",
+			"sparseqr": "cpp"
 		}
 	}
 }