diff --git a/src/libmpg123/sample.h b/src/libmpg123/sample.h
index 4d244fe..ed3ef86 100644
--- a/src/libmpg123/sample.h
+++ b/src/libmpg123/sample.h
@@ -171,7 +171,7 @@ static inline int16_t ftoi16(float x)
 ( (u >= 2147483648UL) \
 	?	(int32_t)((uint32_t)u - (uint32_t)2147483648UL) \
 	:	((u == 0) \
-		?	(int32_t)-2147483648UL \
+		?	-(int32_t)2147483648UL \
 		:	-(int32_t)((uint32_t)2147483648UL - u) ) \
 )
 
diff --git a/src/libsyn123/resample.c b/src/libsyn123/resample.c
index b92f7f2..3552ffa 100644
--- a/src/libsyn123/resample.c
+++ b/src/libsyn123/resample.c
@@ -2005,7 +2005,7 @@ syn123_resample_intotal_64(long inrate, long outrate, int64_t outs)
 	// First offset is -inrate.
 	// You may want to work it out for yourself. Or trust me;-)
 	int err;
-	uint64_t vtot = muloffdiv64(outs, vinrate, -vinrate, voutrate, &err, NULL);
+	uint64_t vtot = muloffdiv64(outs, vinrate, -(int64_t)vinrate, voutrate, &err, NULL);
 	if(err)
 		return SYN123_OVERFLOW;
 	if(vtot == UINT64_MAX)
diff --git a/src/libsyn123/sampleconv.c b/src/libsyn123/sampleconv.c
index 6e8fb3f..7179957 100644
--- a/src/libsyn123/sampleconv.c
+++ b/src/libsyn123/sampleconv.c
@@ -21,6 +21,8 @@
 #include "syn123_int.h"
 #include "sample.h"
 #include "debug.h"
+// Avoid conflict with pragmas in isnan() and friends.
+#undef warning
 
 /* Conversions between native byte order encodings. */
 
diff --git a/src/libsyn123/volume.c b/src/libsyn123/volume.c
index de018a2..a80851d 100644
--- a/src/libsyn123/volume.c
+++ b/src/libsyn123/volume.c
@@ -12,6 +12,8 @@
 #define NO_SMAX
 #include "syn123_int.h"
 #include "debug.h"
+// Avoid conflict with pragmas in isnan() and friends.
+#undef warning
 
 static const double db_min = -SYN123_DB_LIMIT;
 static const double db_max =  SYN123_DB_LIMIT;