diff --git a/src/intel/compiler/brw_asm_tool.c b/src/intel/compiler/brw_asm_tool.c
index fc3d4c8a275..0950c3e60a2 100644
--- a/src/intel/compiler/brw_asm_tool.c
+++ b/src/intel/compiler/brw_asm_tool.c
@@ -132,7 +132,7 @@ int main(int argc, char **argv)
    void *mem_ctx = ralloc_context(NULL);
    FILE *input_file = NULL;
    char *output_file = NULL;
-   char c;
+   int c;
    FILE *output = stdout;
    bool help = false, compact = false;
    uint64_t pci_id = 0;
diff --git a/src/intel/compiler/elk/elk_asm_tool.c b/src/intel/compiler/elk/elk_asm_tool.c
index 9e83e92c259..d1949cfd1bd 100644
--- a/src/intel/compiler/elk/elk_asm_tool.c
+++ b/src/intel/compiler/elk/elk_asm_tool.c
@@ -208,7 +208,7 @@ i965_postprocess_labels()
 int main(int argc, char **argv)
 {
    char *output_file = NULL;
-   char c;
+   int c;
    FILE *output = stdout;
    bool help = false, compact = false;
    void *store;