diff --git a/spa/plugins/filter-graph/plugin_ladspa.c b/spa/plugins/filter-graph/plugin_ladspa.c
index 51167827b..6335d002f 100644
--- a/spa/plugins/filter-graph/plugin_ladspa.c
+++ b/spa/plugins/filter-graph/plugin_ladspa.c
@@ -262,10 +262,10 @@ static int load_ladspa_plugin(struct plugin *impl, const char *path, const char
 	while ((p = split_walk(search_dirs, ":", &len, &state))) {
 		int namelen;
 
-		if (len >= sizeof(filename))
+		if (len == 0 || len >= sizeof(filename))
 			continue;
 
-		if (strncmp(path, p, len) == 0)
+		if (strncmp(path, p, len) == 0 && path[len] == '/')
 			namelen = snprintf(filename, sizeof(filename), "%s", path);
 		else
 			namelen = snprintf(filename, sizeof(filename), "%.*s/%s.so", (int) len, p, path);
diff --git a/src/modules/module-jack-tunnel/weakjack.h b/src/modules/module-jack-tunnel/weakjack.h
index f5c6361ad..472adb253 100644
--- a/src/modules/module-jack-tunnel/weakjack.h
+++ b/src/modules/module-jack-tunnel/weakjack.h
@@ -175,10 +175,10 @@ static inline int weakjack_load(struct weakjack *jack, const char *lib)
 	while ((p = pw_split_walk(search_dirs, ":", &len, &state))) {
 		int pathlen;
 
-		if (len >= sizeof(path))
+		if (len == 0 || len >= sizeof(path))
 			continue;
 
-		if (strncmp(lib, p, len) == 0)
+		if (strncmp(lib, p, len) == 0 && lib[len] == '/')
 			pathlen = snprintf(path, sizeof(path), "%s", lib);
 		else
 			pathlen = snprintf(path, sizeof(path), "%.*s/%s", (int) len, p, lib);