diff --git a/dlls/comctl32/datetime.c b/dlls/comctl32/datetime.c
index 0fae47cc536..9b8842d7c83 100644
--- a/dlls/comctl32/datetime.c
+++ b/dlls/comctl32/datetime.c
@@ -607,7 +607,7 @@ DATETIME_Refresh (DATETIME_INFO *infoPtr, HDC hdc)
     RECT *checkbox = &infoPtr->checkbox;
     SIZE size;
     COLORREF oldTextColor;
-    SHORT fieldWidth;
+    SHORT fieldWidth = 0;
 
     /* draw control edge */
     TRACE("\n");
diff --git a/dlls/itss/chm_lib.c b/dlls/itss/chm_lib.c
index 3eef05d6d88..7ced58d70c5 100644
--- a/dlls/itss/chm_lib.c
+++ b/dlls/itss/chm_lib.c
@@ -1289,7 +1289,7 @@ static Int64 _chm_decompress_region(struct chmFile *h,
     UInt64 nBlock, nOffset;
     UInt64 nLen;
     UInt64 gotLen;
-    UChar *ubuffer;
+    UChar *ubuffer = NULL;
 
         if (len <= 0)
                 return (Int64)0;
diff --git a/dlls/kernel/instr.c b/dlls/kernel/instr.c
index dd23f366492..14ed2269672 100644
--- a/dlls/kernel/instr.c
+++ b/dlls/kernel/instr.c
@@ -103,7 +103,7 @@ static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
 static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
                                    int long_addr, int segprefix, int *len )
 {
-    int mod, rm, base, index = 0, ss = 0, seg = 0, off;
+    int mod, rm, base = 0, index = 0, ss = 0, seg = 0, off;
     LDT_ENTRY entry;
 
 #define GET_VAL(val,type) \
diff --git a/dlls/wineps/truetype.c b/dlls/wineps/truetype.c
index e549584c9f8..609e9af59aa 100644
--- a/dlls/wineps/truetype.c
+++ b/dlls/wineps/truetype.c
@@ -425,7 +425,7 @@ static BOOL BuildTrueTypeAFM(FT_Face face)
 {
     AFM     	*afm;
     AFMMETRICS	*metrics;
-    LPSTR   	font_name, full_name, family_name, encoding_scheme;
+    LPSTR   	font_name, full_name, family_name, encoding_scheme = NULL;
     FT_CharMap	charmap;
     BOOL    	retval, added;
 
diff --git a/dlls/wintab32/context.c b/dlls/wintab32/context.c
index b19b9d932be..d0731b44194 100644
--- a/dlls/wintab32/context.c
+++ b/dlls/wintab32/context.c
@@ -548,7 +548,7 @@ BOOL WINAPI WTPacket(HCTX hCtx, UINT wSerial, LPVOID lpPkt)
 {
     int rc = 0;
     LPOPENCONTEXT context;
-    LPWTPACKET    wtp;
+    LPWTPACKET wtp = NULL;
 
     TRACE("(%p, %d, %p)\n", hCtx, wSerial, lpPkt);
 
diff --git a/programs/winedbg/break.c b/programs/winedbg/break.c
index 717bdaeb441..f5b5cf7bd13 100644
--- a/programs/winedbg/break.c
+++ b/programs/winedbg/break.c
@@ -711,7 +711,7 @@ static	BOOL should_stop(int bpnum)
 BOOL break_should_continue(ADDRESS* addr, DWORD code, int* count, BOOL* is_break)
 {
     int 	        bpnum;
-    DWORD	        oldval;
+    DWORD	        oldval = 0;
     int 	        wpnum;
     enum dbg_exec_mode  mode = dbg_curr_thread->exec_mode;
 
diff --git a/tools/winedump/pe.c b/tools/winedump/pe.c
index b1e099d53da..f0428773535 100644
--- a/tools/winedump/pe.c
+++ b/tools/winedump/pe.c
@@ -292,7 +292,7 @@ static	void	dump_sections(void* addr, unsigned num_sect)
 
 static	void	dump_dir_exported_functions(void)
 {
-    unsigned int size;
+    unsigned int size = 0;
     IMAGE_EXPORT_DIRECTORY	*exportDir = get_dir_and_size(IMAGE_FILE_EXPORT_DIRECTORY, &size);
     unsigned int		i;
     DWORD*			pFunc;