diff --git a/doc/md/Installation_Instructions/Mac-OS-X-Compile-From-Source-Instructions.md b/doc/md/Installation_Instructions/Mac-OS-X-Compile-From-Source-Instructions.md
index 6e5e0df03..e8d79ff78 100644
--- a/doc/md/Installation_Instructions/Mac-OS-X-Compile-From-Source-Instructions.md
+++ b/doc/md/Installation_Instructions/Mac-OS-X-Compile-From-Source-Instructions.md
@@ -42,7 +42,7 @@ vim Makefile.platform
 The following command has been shown to work on MacOS Big Sur with the 
 default Compiler Tools that comes installed on this release of the platform:
 ```bash
-make clean && CFLAGS="" make
+make clean && CFLAGS="-I /usr/local/opt/openssl/include" make
 ```
 If you have ``sudo`` rights, you can install the proxmark3 utilities into the system 
 path by running