diff --git a/tools/cooja/config/external_tools_macosx.config b/tools/cooja/config/external_tools_macosx.config
index 41c387fab..3c923407b 100644
--- a/tools/cooja/config/external_tools_macosx.config
+++ b/tools/cooja/config/external_tools_macosx.config
@@ -13,7 +13,7 @@ CMD_GREP_INTERFACES = grep "^SIM_INTERFACE([^,]*," -o -d skip -D skip -H -r
 REGEXP_PARSE_INTERFACES = ([^/]*.c):SIM_INTERFACE\\(([^,]*),
 CMD_GREP_SENSORS = grep "^SENSORS_SENSOR([^,]*," -o -d skip -D skip -H -r
 REGEXP_PARSE_SENSORS = ([^/]*.c):SENSORS_SENSOR\\(([^,]*),
-COMPILER_ARGS = -Wall -I/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Headers -dynamiclib -fno-common
+COMPILER_ARGS = -Wall -I/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Headers -dynamiclib -fno-common -DHAVE_SNPRINTF
 LINK_COMMAND_1 = gcc -dynamiclib -fno-common -o $(LIBFILE)
 LINK_COMMAND_2 = -framework JavaVM -Wl,-map,$(MAPFILE)
 AR_COMMAND_1 = ar rc $(ARFILE)