diff --git a/src/lsi.c b/src/lsi.c
index 2c6c81f..591b9a0 100644
--- a/src/lsi.c
+++ b/src/lsi.c
@@ -9,19 +9,10 @@
  * of the License, or (at your option) any later version.
  */
 
-#include <stdint.h>
 #include <stdio.h>
 
 #include "lsi.h"
 
-bool lsi_system_is_64bit(void)
-{
-#if UINTPTR_MAX == 0xffffffffffffffff
-        return true;
-#endif
-        return false;
-}
-
 bool lsi_config_load(__lsi_unused__ LsiConfig *config)
 {
         fputs("lsi_config_load(): Not yet implemented", stderr);
diff --git a/src/lsi.h b/src/lsi.h
index 8bda125..371a668 100644
--- a/src/lsi.h
+++ b/src/lsi.h
@@ -12,10 +12,13 @@
 #pragma once
 
 #include <stdbool.h>
+#include <stdint.h>
 
 /* Mark a variable/argument as unused to skip warnings */
 #define __lsi_unused__ __attribute__((unused))
 
+/* Force inlining of a function */
+#define __lsi_inline__ __attribute__((always_inline))
 /**
  * Current Linux Steam Integration settings.
  */
@@ -40,8 +43,16 @@ bool lsi_config_store(LsiConfig *config);
 
 /**
  * Determine if the host system is 64-bit.
+ *
+ * @returns true if 64-bit, otherwise false
  */
-bool lsi_system_is_64bit(void);
+__lsi_inline__ static inline bool lsi_system_is_64bit(void)
+{
+#if UINTPTR_MAX == 0xffffffffffffffff
+        return true;
+#endif
+        return false;
+}
 
 /*
  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html