diff --git a/plugins/amdgpu/amdgpu_plugin.c b/plugins/amdgpu/amdgpu_plugin.c
index cd8b3106e..9d6e0284e 100644
--- a/plugins/amdgpu/amdgpu_plugin.c
+++ b/plugins/amdgpu/amdgpu_plugin.c
@@ -334,6 +334,7 @@ static size_t getenv_size_t(const char *var, size_t defvalue)
 	int sh = 0;
 
 	if (value_str) {
+		errno = 0;
 		val = (size_t)strtoul(value_str, &endp, 0);
 		if (errno || value_str == endp) {
 			pr_err("Ignoring invalid value for %s=%s, expecting a positive integer\n", var, value_str);