diff --git a/tools/mfd_aes_brute/Makefile b/tools/mfd_aes_brute/Makefile
index dc1d426a9..f2d684bed 100644
--- a/tools/mfd_aes_brute/Makefile
+++ b/tools/mfd_aes_brute/Makefile
@@ -23,7 +23,7 @@ endif
 
 # OS X needs linking to openssl
 ifeq ($(USE_BREW),1)
-    MYCFLAGS += -L$(BREW_PREFIX)/opt/openssl@3/include -L$(BREW_PREFIX)/opt/openssl@1.1/include
+    MYCFLAGS += -I$(BREW_PREFIX)/opt/openssl@3/include -I$(BREW_PREFIX)/opt/openssl@1.1/include
     MYLDFLAGS += -L$(BREW_PREFIX)/opt/openssl@3/lib -L$(BREW_PREFIX)/opt/openssl@1.1/lib
 endif