diff --git a/Frameworks/Dumb/dumb/include/dumb.h b/Frameworks/Dumb/dumb/include/dumb.h
index 77d8fc1e1..32274ba5f 100644
--- a/Frameworks/Dumb/dumb/include/dumb.h
+++ b/Frameworks/Dumb/dumb/include/dumb.h
@@ -679,7 +679,10 @@ typedef struct DUMB_VOLUME_RAMP_INFO DUMB_VOLUME_RAMP_INFO;
 
 typedef void (*DUMB_RESAMPLE_PICKUP)(DUMB_RESAMPLER *resampler, void *data);
 
+#ifndef BLIP_T_DEFINED
+#define BLIP_T_DEFINED
 typedef struct blip_t blip_t;
+#endif
 
 struct DUMB_RESAMPLER
 {
diff --git a/Frameworks/Dumb/dumb/include/internal/blip_buf.h b/Frameworks/Dumb/dumb/include/internal/blip_buf.h
index 6888fa37a..6bf37836e 100644
--- a/Frameworks/Dumb/dumb/include/internal/blip_buf.h
+++ b/Frameworks/Dumb/dumb/include/internal/blip_buf.h
@@ -11,7 +11,10 @@ Sample buffer that resamples from input clock rate to output sample rate */
 
 /** First parameter of most functions is blip_t*, or const blip_t* if nothing
 is changed. */
+#ifndef BLIP_T_DEFINED
+#define BLIP_T_DEFINED
 typedef struct blip_t blip_t;
+#endif
 
 /** Creates new buffer that can hold at most sample_count samples. Sets rates
 so that there are blip_max_ratio clocks per sample. Returns pointer to new