diff --git a/CHANGELOG.md b/CHANGELOG.md
index 95f0548..f7d288f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.1.4 (unreleased)
+
+- Fixed multiple definition error with GCC 10
+
 ## 0.1.3 (2021-05-06)
 
 - Added Dockerfile
diff --git a/src/ivfflat.c b/src/ivfflat.c
index 93e1d30..4192cfb 100644
--- a/src/ivfflat.c
+++ b/src/ivfflat.c
@@ -6,6 +6,7 @@
 #include "utils/guc.h"
 #include "utils/selfuncs.h"
 
+int			ivfflat_probes;
 static relopt_kind ivfflat_relopt_kind;
 
 /*
diff --git a/src/ivfflat.h b/src/ivfflat.h
index 8d28b81..1adab84 100644
--- a/src/ivfflat.h
+++ b/src/ivfflat.h
@@ -38,7 +38,7 @@
 #endif
 
 /* Variables */
-int			ivfflat_probes;
+extern int	ivfflat_probes;
 
 typedef struct VectorArrayData
 {