diff --git a/src/stub/src/i386-bsd.elf-main.c b/src/stub/src/i386-bsd.elf-main.c
index 86d09cf9..caca24fd 100644
--- a/src/stub/src/i386-bsd.elf-main.c
+++ b/src/stub/src/i386-bsd.elf-main.c
@@ -62,7 +62,7 @@ decimal(int x, char *ptr, int n)
 {
     if (x < 0) {
         x = -x;
-        *ptr = '-'; ++n;
+        *ptr[n++] = '-';
     }
     return unsimal(x, ptr, n);
 }
diff --git a/src/stub/src/i386-linux.elf-main.c b/src/stub/src/i386-linux.elf-main.c
index 0f6ac410..48951636 100644
--- a/src/stub/src/i386-linux.elf-main.c
+++ b/src/stub/src/i386-linux.elf-main.c
@@ -123,7 +123,7 @@ decimal(int x, char *ptr, int n)
 {
     if (x < 0) {
         x = -x;
-        *ptr = '-'; ++n;
+        *ptr[n++] = '-';
     }
     return unsimal(x, ptr, n);
 }
diff --git a/src/stub/src/i386-openbsd.elf-main.c b/src/stub/src/i386-openbsd.elf-main.c
index 49f12624..a8d9b275 100644
--- a/src/stub/src/i386-openbsd.elf-main.c
+++ b/src/stub/src/i386-openbsd.elf-main.c
@@ -62,7 +62,7 @@ decimal(int x, char *ptr, int n)
 {
     if (x < 0) {
         x = -x;
-        *ptr = '-'; ++n;
+        *ptr[n++] = '-';
     }
     return unsimal(x, ptr, n);
 }