diff --git a/src/Makefile b/src/Makefile
index f12bae6..9ef30e9 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,7 +1,7 @@
 CC=gcc
-CFLAGS=-g -O2 -ffile-prefix-map=/=. -fstack-protector-strong -Wformat -Werror=format-security
+CFLAGS=-I/usr/include/exim4 -g -O2 -ffile-prefix-map=/=. -fstack-protector-strong -Wformat -Werror=format-security
 LDFLAGS=-Wl,-z,relro -lsodium
-LDFLAGS_LIB=-I/usr/include/exim4 -fpic -shared -export-dynamic
+LDFLAGS_LIB=-fpic -shared -export-dynamic
 
 .PHONY: clean all
 
@@ -16,4 +16,4 @@ genkey: genkey.c
 clean:
 	rm -f libexim-encrypt-dlfunc.so genkey
 
-all: libexim-encrypt-dlfunc.so genkey
\ No newline at end of file
+all: libexim-encrypt-dlfunc.so genkey