diff --git a/src/ranap/Makefile b/src/ranap/Makefile
index bcd7fd1..4f84d8a 100644
--- a/src/ranap/Makefile
+++ b/src/ranap/Makefile
@@ -999,7 +999,8 @@
 libsomething_la_SOURCES=$(ASN_MODULE_SOURCES)
 
 # Remove the lines below to convert it into a pure .am file
-CFLAGS += -I. `pkg-config --cflags libasn1c`
+PKG_INCLUDES:=$(shell pkg-config --cflags libasn1c)
+CFLAGS += -I. $(PKG_INCLUDES)
 OBJS=${ASN_MODULE_SOURCES:.c=.o} ${ASN_CONVERTER_SOURCES:.c=.o}
 
 all: libosmo-asn1-ranap.a