diff --git a/src/add-ons/kernel/file_systems/cdda/kernel_interface.cpp b/src/add-ons/kernel/file_systems/cdda/kernel_interface.cpp
index 8e0f239aba..3c599a3c22 100644
--- a/src/add-ons/kernel/file_systems/cdda/kernel_interface.cpp
+++ b/src/add-ons/kernel/file_systems/cdda/kernel_interface.cpp
@@ -1454,7 +1454,7 @@ cdda_scan_partition(int fd, partition_data* partition, void* _cookie)
 	uint32 lastTrack = toc->last_track + 1 - toc->first_track;
 	scsi_cd_msf& end = toc->tracks[lastTrack].start.time;
 
-	partition->content_size = off_t(end.minute * kFramesPerMinute
+	partition->content_size = ((off_t)end.minute * kFramesPerMinute
 		+ end.second * kFramesPerSecond + end.frame) * kFrameSize;
 	partition->block_size = kFrameSize;
 
diff --git a/src/add-ons/kernel/file_systems/exfat/kernel_interface.cpp b/src/add-ons/kernel/file_systems/exfat/kernel_interface.cpp
index 517f1a2c04..45a5f1e36d 100644
--- a/src/add-ons/kernel/file_systems/exfat/kernel_interface.cpp
+++ b/src/add-ons/kernel/file_systems/exfat/kernel_interface.cpp
@@ -96,9 +96,9 @@ exfat_identify_partition(int fd, partition_data* partition, void** _cookie)
 	uint32 rootDirCluster = superBlock.RootDirCluster();
 	uint32 blockSize = 1 << superBlock.BlockShift();
 	uint32 clusterSize = blockSize << superBlock.BlocksPerClusterShift();
-	uint64 rootDirectoryOffset = (uint64)(EXFAT_SUPER_BLOCK_OFFSET
-		+ superBlock.FirstDataBlock() * blockSize
-		+ (rootDirCluster - 2) * clusterSize);
+	uint64 rootDirectoryOffset = EXFAT_SUPER_BLOCK_OFFSET
+		+ (uint64)superBlock.FirstDataBlock() * blockSize
+		+ (rootDirCluster - 2) * clusterSize;
 	struct exfat_entry entry;
 	size_t entrySize = sizeof(struct exfat_entry);
 	for (uint32 i = 0; read_pos(fd, rootDirectoryOffset + i * entrySize,
diff --git a/src/add-ons/media/media-add-ons/usb_webcam/addons/sonix/SonixCamDevice.cpp b/src/add-ons/media/media-add-ons/usb_webcam/addons/sonix/SonixCamDevice.cpp
index eb20ace8eb..0cc7549198 100644
--- a/src/add-ons/media/media-add-ons/usb_webcam/addons/sonix/SonixCamDevice.cpp
+++ b/src/add-ons/media/media-add-ons/usb_webcam/addons/sonix/SonixCamDevice.cpp
@@ -634,10 +634,10 @@ SonixCamDevice::MinRawFrameSize()
 {
 	// if (fCompressionEnabled) { ... return ; }
 	BRect vf(VideoFrame());
-	int w = vf.IntegerWidth()+1;
-	int h = vf.IntegerHeight()+1;
+	size_t w = vf.IntegerWidth()+1;
+	size_t h = vf.IntegerHeight()+1;
 	// 1 byte/pixel
-	return (size_t)(w*h);
+	return w * h;
 }
 
 
diff --git a/src/bin/unzip/fileio.c b/src/bin/unzip/fileio.c
index df72a22587..7d4609ba4b 100644
--- a/src/bin/unzip/fileio.c
+++ b/src/bin/unzip/fileio.c
@@ -1713,7 +1713,7 @@ time_t dos_to_unix_time(dosdatetime)
         ++days;                 /* OK through 2199 */
 
     /* convert date & time to seconds relative to 00:00:00, 01/01/YRBASE */
-    m_time = (time_t)((unsigned long)(days + dy) * 86400L +
+    m_time = (time_t)(((unsigned long)days + dy) * 86400L +
                       (unsigned long)hh * 3600L +
                       (unsigned long)(mm * 60 + ss));
       /* - 1;   MS-DOS times always rounded up to nearest even second */
diff --git a/src/kits/package/hpkg/PackageFileHeapReader.cpp b/src/kits/package/hpkg/PackageFileHeapReader.cpp
index fb1449b63f..796e51e1a4 100644
--- a/src/kits/package/hpkg/PackageFileHeapReader.cpp
+++ b/src/kits/package/hpkg/PackageFileHeapReader.cpp
@@ -157,7 +157,7 @@ PackageFileHeapReader::ReadAndDecompressChunk(size_t chunkIndex,
 {
 	uint64 offset = fOffsets[chunkIndex];
 	bool isLastChunk
-		= uint64(chunkIndex + 1) * kChunkSize >= fUncompressedHeapSize;
+		= ((uint64)chunkIndex + 1) * kChunkSize >= fUncompressedHeapSize;
 	size_t compressedSize = isLastChunk
 		? fCompressedHeapSize - offset
 		: fOffsets[chunkIndex + 1] - offset;
diff --git a/src/kits/tracker/WidgetAttributeText.cpp b/src/kits/tracker/WidgetAttributeText.cpp
index d36d425bd8..f3a39e30d4 100644
--- a/src/kits/tracker/WidgetAttributeText.cpp
+++ b/src/kits/tracker/WidgetAttributeText.cpp
@@ -1731,7 +1731,7 @@ GenericAttributeText::CommitEditedTextFlavor(BTextView* textView)
 	switch (type) {
 		case B_STRING_TYPE:
 			size = fModel->WriteAttr(columnName, type, 0, textView->Text(),
-				(size_t)(textView->TextLength() + 1));
+				(size_t)textView->TextLength() + 1);
 			break;
 
 		case B_BOOL_TYPE:
diff --git a/src/system/libnetwork/netresolv/nameser/ns_name.c b/src/system/libnetwork/netresolv/nameser/ns_name.c
index 75afb0802b..4471eafa8c 100644
--- a/src/system/libnetwork/netresolv/nameser/ns_name.c
+++ b/src/system/libnetwork/netresolv/nameser/ns_name.c
@@ -597,7 +597,7 @@ ns_name_pack(const u_char *src, u_char *dst, int dstsiz,
 		if (dstp + 1 + n >= eob) {
 			goto cleanup;
 		}
-		memcpy(dstp, srcp, (size_t)(n + 1));
+		memcpy(dstp, srcp, (size_t)n + 1);
 		srcp += n + 1;
 		dstp += n + 1;
 	} while (n != 0);
diff --git a/src/system/libnetwork/netresolv/nameser/ns_print.c b/src/system/libnetwork/netresolv/nameser/ns_print.c
index 135c4f18fe..df7dabba98 100644
--- a/src/system/libnetwork/netresolv/nameser/ns_print.c
+++ b/src/system/libnetwork/netresolv/nameser/ns_print.c
@@ -154,7 +154,7 @@ ns_sprintrrf(const u_char *msg, size_t msglen,
 	addlen((size_t)x, &buf, &buflen);
 	len = SPRINTF((tmp, " %s %s", p_class(class), p_type(type)));
 	T(addstr(tmp, (size_t)len, &buf, &buflen));
-	T(spaced = addtab((size_t)(x + len), (size_t)16, spaced, &buf, &buflen));
+	T(spaced = addtab((size_t)x + len, (size_t)16, spaced, &buf, &buflen));
 
 	/*
 	 * RData.