diff --git a/ext/sbc/gstsbcenc.c b/ext/sbc/gstsbcenc.c
index bfb5c65efe..9a2f3e294c 100644
--- a/ext/sbc/gstsbcenc.c
+++ b/ext/sbc/gstsbcenc.c
@@ -158,10 +158,10 @@ GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("audio/x-sbc, "
         "rate = (int) { 16000, 32000, 44100, 48000 }, "
         "channels = (int) [ 1, 2 ], "
-        "mode = (string) { mono, dual, stereo, joint }, "
+        "mode = (string) { \"mono\", \"dual\", \"stereo\", \"joint\" }, "
         "blocks = (int) { 4, 8, 12, 16 }, "
         "subbands = (int) { 4, 8 }, "
-        "allocation = (string) { snr, loudness },"
+        "allocation = (string) { \"snr\", \"loudness\" }, "
         "bitpool = (int) [ " SBC_ENC_BITPOOL_MIN_STR
         ", " SBC_ENC_BITPOOL_MAX_STR " ]"));
 
diff --git a/ext/sbc/gstsbcparse.c b/ext/sbc/gstsbcparse.c
index 0c3dc8024d..a688c6865b 100644
--- a/ext/sbc/gstsbcparse.c
+++ b/ext/sbc/gstsbcparse.c
@@ -50,10 +50,10 @@ GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("audio/x-sbc, "
         "rate = (int) { 16000, 32000, 44100, 48000 }, "
         "channels = (int) [ 1, 2 ], "
-        "mode = (string) { mono, dual, stereo, joint }, "
+        "mode = (string) { \"mono\", \"dual\", \"stereo\", \"joint\" }, "
         "blocks = (int) { 4, 8, 12, 16 }, "
         "subbands = (int) { 4, 8 }, "
-        "allocation = (string) { snr, loudness },"
+        "allocation = (string) { \"snr\", \"loudness\" },"
         "bitpool = (int) [ 2, 64 ]," "parsed = (boolean) true"));
 
 static GstFlowReturn