diff --git a/ext/sst/Makefile b/ext/sst/Makefile
index 682af3d9ff..9213d266e9 100644
--- a/ext/sst/Makefile
+++ b/ext/sst/Makefile
@@ -4,7 +4,7 @@ ARCH=RISCV
 OFLAG=3
 
 LDFLAGS=-shared -fno-common ${shell pkg-config ${SST_VERSION} --libs} -L../../build/${ARCH}/ -Wl,-rpath ../../build/${ARCH}
-CXXFLAGS=-std=c++17 -g -O${OFLAG} -fPIC ${shell pkg-config ${SST_VERSION} --cflags} ${shell python3-config --includes} -I../../build/${ARCH}/ -I../../ext/pybind11/include/ -I../../build/softfloat/
+CXXFLAGS=-std=c++17 -g -O${OFLAG} -fPIC ${shell pkg-config ${SST_VERSION} --cflags} ${shell python3-config --includes} -I../../build/${ARCH}/ -I../../ext/pybind11/include/ -I../../build/softfloat/ -I../../ext
 CPPFLAGS+=-MMD -MP
 SRC=$(wildcard *.cc)
 
diff --git a/util/systemc/gem5_within_systemc/Makefile b/util/systemc/gem5_within_systemc/Makefile
index cc6a38917d..f2baf88c20 100644
--- a/util/systemc/gem5_within_systemc/Makefile
+++ b/util/systemc/gem5_within_systemc/Makefile
@@ -39,7 +39,7 @@ VARIANT = opt
 SYSTEMC_INC = /opt/systemc/include
 SYSTEMC_LIB = /opt/systemc/lib-linux64
 
-CXXFLAGS = -I../../../build/$(ARCH) -L../../../build/$(ARCH)
+CXXFLAGS = -I../../../build/$(ARCH) -L../../../build/$(ARCH) -I../../../ext/
 CXXFLAGS += -I$(SYSTEMC_INC) -L$(SYSTEMC_LIB)
 CXXFLAGS += -std=c++17
 CXXFLAGS += -g -DTRACING_ON