diff --git a/Makefile.cfg b/Makefile.cfg
index f5eabf13a91a12800ca37c834a17aa1e6be061cb..85b811f9a2d4a11f3a121c7906dfc7e9bc7be278 100644
--- a/Makefile.cfg
+++ b/Makefile.cfg
@@ -369,6 +369,10 @@ ifeq ($(PLATFORM), LINUX)
     CPPFLAGS += -DUSE_EPOLL
 endif
 
+ifdef ALPINE_LINUX
+    CPPFLAGS += -DALPINE_LINUX
+endif
+
 #not useful in compiler2/asn1, for example
 #REL_DIR := $(notdir $(CURDIR))