diff --git a/lib/legacy/zstd_v01.c b/lib/legacy/zstd_v01.c
index ad3c9330e..29e875713 100644
--- a/lib/legacy/zstd_v01.c
+++ b/lib/legacy/zstd_v01.c
@@ -430,7 +430,7 @@ static unsigned FSE_isError(size_t code) { return (code > (size_t)(-FSE_ERROR_ma
 
 static short FSE_abs(short a)
 {
-    return a<0? -a : a;
+    return a<0? (short)-a : a;
 }
 
 
diff --git a/lib/legacy/zstd_v03.c b/lib/legacy/zstd_v03.c
index 7d82db666..50fa87cf3 100644
--- a/lib/legacy/zstd_v03.c
+++ b/lib/legacy/zstd_v03.c
@@ -1111,7 +1111,7 @@ static unsigned FSE_isError(size_t code) { return ERR_isError(code); }
 ****************************************************************/
 static short FSE_abs(short a)
 {
-    return a<0 ? -a : a;
+    return a<0 ? (short)-a : a;
 }
 
 static size_t FSE_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr,
diff --git a/lib/legacy/zstd_v04.c b/lib/legacy/zstd_v04.c
index 0da316c15..31c205258 100644
--- a/lib/legacy/zstd_v04.c
+++ b/lib/legacy/zstd_v04.c
@@ -1094,7 +1094,7 @@ static unsigned FSE_isError(size_t code) { return ERR_isError(code); }
 ****************************************************************/
 static short FSE_abs(short a)
 {
-    return a<0 ? -a : a;
+    return a<0 ? (short)-a : a;
 }
 
 static size_t FSE_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr,
diff --git a/lib/legacy/zstd_v05.c b/lib/legacy/zstd_v05.c
index 7a3af4214..e1efca597 100644
--- a/lib/legacy/zstd_v05.c
+++ b/lib/legacy/zstd_v05.c
@@ -1224,7 +1224,7 @@ const char* FSEv05_getErrorName(size_t code) { return ERR_getErrorName(code); }
 /*-**************************************************************
 *  FSEv05 NCount encoding-decoding
 ****************************************************************/
-static short FSEv05_abs(short a) { return a<0 ? -a : a; }
+static short FSEv05_abs(short a) { return a<0 ? (short)-a : a; }
 
 
 size_t FSEv05_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr,
diff --git a/lib/legacy/zstd_v06.c b/lib/legacy/zstd_v06.c
index 88a39e2a0..fb8c14df9 100644
--- a/lib/legacy/zstd_v06.c
+++ b/lib/legacy/zstd_v06.c
@@ -1202,7 +1202,7 @@ static unsigned HUFv06_isError(size_t code) { return ERR_isError(code); }
 /*-**************************************************************
 *  FSE NCount encoding-decoding
 ****************************************************************/
-static short FSEv06_abs(short a) { return a<0 ? -a : a; }
+static short FSEv06_abs(short a) { return a<0 ? (short)-a : a; }
 
 size_t FSEv06_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr,
                  const void* headerBuffer, size_t hbSize)