diff --git a/Makefile b/Makefile
index 96c133da9..308b1df30 100644
--- a/Makefile
+++ b/Makefile
@@ -143,6 +143,11 @@ LIBS += -lrt
 endif
 endif
 
+ifeq ($(OS), Haiku)
+# Allow usage of non-posix vasprintf, mkstemps functions
+CXXFLAGS += -D_DEFAULT_SOURCE
+endif
+
 YOSYS_VER := 0.43+3
 
 # Note: We arrange for .gitcommit to contain the (short) commit hash in
diff --git a/kernel/yosys.cc b/kernel/yosys.cc
index 57433d0d9..fca2bca67 100644
--- a/kernel/yosys.cc
+++ b/kernel/yosys.cc
@@ -967,7 +967,7 @@ std::string proc_self_dirname()
 {
 	return "/";
 }
-#elif defined(__OpenBSD__)
+#elif defined(__OpenBSD__) || defined(__HAIKU__)
 char yosys_path[PATH_MAX];
 char *yosys_argv0;