diff --git a/src/rvprof_internal.h b/src/rvprof_internal.h
new file mode 100644
index 0000000..3769bfc
--- /dev/null
+++ b/src/rvprof_internal.h
@@ -0,0 +1,31 @@
+#ifndef RVPROF_INTERNAL_H
+#define RVPROF_INTERNAL_H
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#ifdef __cplusplus
+extern "C"{
+#endif 
+
+// constants
+#define INITIAL_FUNCTIONS 128
+#define INITIAL_STACKS 256
+#define INITIAL_REGIONS 128
+#define INITIAL_SYMBOLS 512
+#define GROWTH_FACTOR 2
+#define MAX_NAME_LEN 64
+
+
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
\ No newline at end of file