diff --git a/src/lsl_inlet_c.cpp b/src/lsl_inlet_c.cpp
index c9782a6e0..ec7c409eb 100644
--- a/src/lsl_inlet_c.cpp
+++ b/src/lsl_inlet_c.cpp
@@ -116,7 +116,7 @@ LIBLSL_C_API double lsl_pull_sample_str(
 				if (ec) *ec = lsl_internal_error;
 				return 0.0;
 			}
-			memcpy(buffer[k], tmp[k].c_str(), tmp[k].size());
+			memcpy(buffer[k], tmp[k].data(), tmp[k].size());
 			buffer[k][tmp[k].size()] = '\0';
 		}
 		return result;
@@ -219,7 +219,7 @@ LIBLSL_C_API unsigned long lsl_pull_chunk_str(lsl_inlet in, char **data_buffer,
 					if (ec) *ec = lsl_internal_error;
 					return 0;
 				}
-				memcpy(data_buffer[k], tmp[k].c_str(), tmp[k].size());
+				memcpy(data_buffer[k], tmp[k].data(), tmp[k].size());
 				data_buffer[k][tmp[k].size()] = '\0';
 			}
 			return result;
@@ -248,7 +248,7 @@ LIBLSL_C_API unsigned long lsl_pull_chunk_buf(lsl_inlet in, char **data_buffer,
 					return 0;
 				}
 				lengths_buffer[k] = (uint32_t)tmp[k].size();
-				memcpy(data_buffer[k], tmp[k].c_str(), tmp[k].size());
+				memcpy(data_buffer[k], tmp[k].data(), tmp[k].size());
 				data_buffer[k][tmp[k].size()] = '\0';
 			}
 			return result;
diff --git a/src/lsl_streaminfo_c.cpp b/src/lsl_streaminfo_c.cpp
index dbf6df37f..566356f6c 100644
--- a/src/lsl_streaminfo_c.cpp
+++ b/src/lsl_streaminfo_c.cpp
@@ -59,7 +59,7 @@ LIBLSL_C_API char *lsl_get_xml(lsl_streaminfo info) {
 			LOG_F(ERROR, "Error allocating memory for xmlinfo");
 			return nullptr;
 		}
-		memcpy(result, tmp.c_str(), tmp.size());
+		memcpy(result, tmp.data(), tmp.size());
 		result[tmp.size()] = '\0';
 		return result;
 	} catch (std::exception &e) {