diff --git a/gdk/Makefile.am b/gdk/Makefile.am
index 91da7bdb3c..188ff56326 100644
--- a/gdk/Makefile.am
+++ b/gdk/Makefile.am
@@ -35,6 +35,7 @@ EXTRA_DIST += 			\
 
 GDK_CFLAGS_DEFINES =	\
 	-DG_LOG_DOMAIN=\"Gdk\"		\
+	-DG_LOG_USE_STRUCTURED=1	\
 	-DGDK_COMPILATION
 
 
diff --git a/gdk/broadway/Makefile.am b/gdk/broadway/Makefile.am
index 59dc5d09a5..f1c392353f 100644
--- a/gdk/broadway/Makefile.am
+++ b/gdk/broadway/Makefile.am
@@ -7,6 +7,7 @@ libgdkbroadwayincludedir = $(includedir)/gtk-3.0/gdk/broadway
 
 AM_CPPFLAGS =				\
 	-DG_LOG_DOMAIN=\"Gdk\"		\
+	-DG_LOG_USE_STRUCTURED=1	\
 	-DGDK_COMPILATION		\
 	-I$(top_srcdir)			\
 	-I$(top_srcdir)/gdk		\
diff --git a/gdk/mir/Makefile.am b/gdk/mir/Makefile.am
index ea2dac86c4..71b6e37210 100644
--- a/gdk/mir/Makefile.am
+++ b/gdk/mir/Makefile.am
@@ -6,6 +6,7 @@ libgdkmirincludedir = $(includedir)/gtk-3.0/gdk/mir
 
 AM_CPPFLAGS = \
 	-DG_LOG_DOMAIN=\"Gdk\" \
+	-DG_LOG_USE_STRUCTURED=1	\
 	-DGDK_COMPILATION \
 	-I$(top_srcdir) \
 	-I$(top_srcdir)/gdk \
diff --git a/gdk/quartz/Makefile.am b/gdk/quartz/Makefile.am
index 8954849a62..18fdbd3355 100644
--- a/gdk/quartz/Makefile.am
+++ b/gdk/quartz/Makefile.am
@@ -5,6 +5,7 @@ libgdkquartzincludedir = $(includedir)/gtk-3.0/gdk/quartz
 
 AM_CPPFLAGS = 				\
 	-DG_LOG_DOMAIN=\"Gdk\"		\
+	-DG_LOG_USE_STRUCTURED=1	\
 	-DGDK_COMPILATION		\
 	-I$(top_srcdir)			\
 	-I$(top_srcdir)/gdk		\
diff --git a/gdk/wayland/Makefile.am b/gdk/wayland/Makefile.am
index ba568d7f06..fdadb242a7 100644
--- a/gdk/wayland/Makefile.am
+++ b/gdk/wayland/Makefile.am
@@ -6,6 +6,7 @@ libgdkwaylandincludedir = $(includedir)/gtk-3.0/gdk/wayland
 
 AM_CPPFLAGS =					\
 	-DG_LOG_DOMAIN=\"Gdk\"			\
+	-DG_LOG_USE_STRUCTURED=1		\
 	-DGDK_COMPILATION			\
 	-I$(top_srcdir)				\
 	-I$(top_srcdir)/gdk			\
diff --git a/gdk/win32/Makefile.am b/gdk/win32/Makefile.am
index 5b3af48574..991bf708cb 100644
--- a/gdk/win32/Makefile.am
+++ b/gdk/win32/Makefile.am
@@ -6,6 +6,7 @@ libgdkwin32includedir = $(includedir)/gtk-3.0/gdk/win32
 
 AM_CPPFLAGS = \
 	-DG_LOG_DOMAIN=\"Gdk\"		\
+	-DG_LOG_USE_STRUCTURED=1	\
 	-DINSIDE_GDK_WIN32		\
 	-I$(top_srcdir)			\
 	-I$(top_srcdir)/gdk		\
diff --git a/gdk/x11/Makefile.am b/gdk/x11/Makefile.am
index 6223e7e3fa..6289f3ac79 100644
--- a/gdk/x11/Makefile.am
+++ b/gdk/x11/Makefile.am
@@ -6,6 +6,7 @@ libgdkx11includedir = $(includedir)/gtk-3.0/gdk/x11
 
 AM_CPPFLAGS = 				\
 	-DG_LOG_DOMAIN=\"Gdk\"		\
+	-DG_LOG_USE_STRUCTURED=1	\
 	-DGDK_COMPILATION		\
 	-I$(top_srcdir)			\
 	-I$(top_srcdir)/gdk		\
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 81692cef33..611b96eac0 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -4,6 +4,7 @@ include $(top_srcdir)/Makefile.decl
 
 GTK_BASE_CFLAGS_DEFINES =				\
 	-DG_LOG_DOMAIN=\"Gtk\"				\
+	-DG_LOG_USE_STRUCTURED=1			\
 	-DGTK_VERSION=\"$(GTK_VERSION)\"		\
 	-DGTK_BINARY_VERSION=\"$(GTK_BINARY_VERSION)\"	\
 	-DGTK_COMPILATION				\