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-rw-r--r--libguile/strings.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libguile/strings.h b/libguile/strings.h
index 4e5f70098..601bd9c6b 100644
--- a/libguile/strings.h
+++ b/libguile/strings.h
@@ -198,7 +198,7 @@ SCM_INTERNAL void scm_i_get_substring_spec (size_t len,
SCM_API SCM scm_sys_string_dump (SCM);
SCM_API SCM scm_sys_symbol_dump (SCM);
-#if SCM_STRING_LENGTH_HISTOGRAM
+#ifdef SCM_STRING_LENGTH_HISTOGRAM
SCM_API SCM scm_sys_stringbuf_hist (void);
#endif