diff --git a/adb/Android.mk b/adb/Android.mk
index ca337ee..6bfc503 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -15,7 +15,7 @@
     -Wno-unused-parameter \
     -Wno-missing-field-initializers \
     -Wvla \
-    -DADB_VERSION=\"$(tool_version)\" \
+    -DADB_VERSION="\"$(tool_version)\""
 
 ADB_COMMON_posix_CFLAGS := \
     -Wexit-time-destructors \
diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index 4d54175..80def73 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -18,7 +18,7 @@
 
 include $(CLEAR_VARS)
 
-LOCAL_CFLAGS += -DFASTBOOT_VERSION=\"$(tool_version)\"
+LOCAL_CFLAGS += -DFASTBOOT_VERSION="\"$(tool_version)\""
 
 LOCAL_C_INCLUDES := \
   $(LOCAL_PATH)/../adb \