diff --git a/src/libs/aggregation/aggregation.qbs b/src/libs/aggregation/aggregation.qbs
index 9edc3f45f95..1c817669958 100644
--- a/src/libs/aggregation/aggregation.qbs
+++ b/src/libs/aggregation/aggregation.qbs
@@ -8,6 +8,7 @@ QtcLibrary {
         ".",
         ".."
     ]
+    cpp.defines: base.concat("AGGREGATION_LIBRARY")
 
     Depends { name: "cpp" }
     Depends { name: "Qt.core" }
diff --git a/src/libs/zeroconf/zeroconf.qbs b/src/libs/zeroconf/zeroconf.qbs
index 3da7b7a61b2..fcc98878a15 100644
--- a/src/libs/zeroconf/zeroconf.qbs
+++ b/src/libs/zeroconf/zeroconf.qbs
@@ -8,6 +8,8 @@ QtcLibrary {
     Depends { name: "Qt.network" }
 
     cpp.includePaths: "."
+    cpp.defines: base.concat("ZEROCONF_LIBRARY")
+
     Properties {
         condition: qbs.targetOS == "windows"
         cpp.dynamicLibraries:  "ws2_32"