diff --git a/meson.build b/meson.build
index 6d08d3007..51da224cc 100644
--- a/meson.build
+++ b/meson.build
@@ -77,10 +77,12 @@ common_flags = [
   '-Wmissing-braces',
   '-Wtype-limits',
   '-Wvariadic-macros',
+  '-Wmaybe-uninitialized',
   '-Wno-missing-field-initializers',
   '-Wno-unused-parameter',
   '-Wno-pedantic',
   '-Wold-style-declaration',
+  '-Wdeprecated-declarations',
   '-Wunused-result',
 ]
 
diff --git a/spa/plugins/alsa/alsa-udev.c b/spa/plugins/alsa/alsa-udev.c
index 0ce8884c5..6e666cc53 100644
--- a/spa/plugins/alsa/alsa-udev.c
+++ b/spa/plugins/alsa/alsa-udev.c
@@ -184,7 +184,7 @@ static void unescape(const char *src, char *dst)
 {
 	const char *s;
 	char *d;
-	int h1, h2;
+	int h1 = 0, h2 = 0;
 	enum { TEXT, BACKSLASH, EX, FIRST } state = TEXT;
 
 	for (s = src, d = dst; *s; s++) {
diff --git a/spa/plugins/v4l2/v4l2-udev.c b/spa/plugins/v4l2/v4l2-udev.c
index d9d3c7a66..ff5433e08 100644
--- a/spa/plugins/v4l2/v4l2-udev.c
+++ b/spa/plugins/v4l2/v4l2-udev.c
@@ -169,7 +169,7 @@ static void unescape(const char *src, char *dst)
 {
 	const char *s;
 	char *d;
-	int h1, h2;
+	int h1 = 0, h2 = 0;
 	enum { TEXT, BACKSLASH, EX, FIRST } state = TEXT;
 
 	for (s = src, d = dst; *s; s++) {