diff --git a/ChangeLog b/ChangeLog
index 87ceb27..f7e74ea 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -111,6 +111,7 @@ been re-factored and no longer includes pcre2_internal.h.
 26. Minor code refactor to avoid "array subscript is below array bounds" 
 compiler warning.
 
+27. Minor code refactor to avoid "left shift of negative number" warning. 
 
 
 Version 10.21 12-January-2016
diff --git a/src/pcre2_jit_compile.c b/src/pcre2_jit_compile.c
index 3927d2c..5349475 100644
--- a/src/pcre2_jit_compile.c
+++ b/src/pcre2_jit_compile.c
@@ -539,12 +539,12 @@ the start pointers when the end of the capturing group has not yet reached. */
 #define MOV_UCHAR  SLJIT_MOV_U16
 #define MOVU_UCHAR SLJIT_MOVU_U16
 #define UCHAR_SHIFT (1)
-#define IN_UCHARS(x) ((x) << UCHAR_SHIFT)
+#define IN_UCHARS(x) ((x) * 2)
 #elif PCRE2_CODE_UNIT_WIDTH == 32
 #define MOV_UCHAR  SLJIT_MOV_U32
 #define MOVU_UCHAR SLJIT_MOVU_U32
 #define UCHAR_SHIFT (2)
-#define IN_UCHARS(x) ((x) << UCHAR_SHIFT)
+#define IN_UCHARS(x) ((x) * 4)
 #else
 #error Unsupported compiling mode
 #endif