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-rw-r--r--src/mesa/main/extensions.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index 5f2c74a758e..a843a40925c 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -754,7 +754,7 @@ get_extension_override( struct gl_context *ctx )
/* Remove trailing space. */
len = strlen(extra_exts);
- if (extra_exts[len - 1] == ' ')
+ if (len > 0 && extra_exts[len - 1] == ' ')
extra_exts[len - 1] = '\0';
return extra_exts;